Patent Publication Number: US-2023147982-A1

Title: Capacitor component

Description:
CROSS-REFERENCE TO RELATED APPLICATION(S) 
     This application claims benefit under 35 USC 119 (a) of Korean Patent Application No. 10-2021-0154820 filed on Nov. 11, 2021 in the Korean Intellectual Property Office, the entire disclosure of which is incorporated herein by reference for all purposes. 
     TECHNICAL FIELD 
     The present disclosure relates to a capacitor component. 
     BACKGROUND 
     MLCCs, capacitor components, are important chip components used in industries such as the communications, computing, home appliance, and automobile industries due to small size, high capacitance, and ease thereof in mounting, and in detail, are key passive elements used in various electric, electronic and information communication devices such as mobile phones, computers, and digital TVs. 
     Recently, according to miniaturization and high performance of electronic devices, MLCCs have also tended to be smaller sized and higher in capacitance, and with this trend, the importance of securing high reliability of capacitor components has been increasing. 
     SUMMARY 
     This summary is provided to introduce a selection of concepts in simplified form that are further described below in the Detailed Description. This Summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter. 
     An aspect of the present disclosure is to provide a capacitor component having improved reliability. 
     According to an aspect of the present disclosure, a capacitor component includes a body including a dielectric layer and an internal electrode layer; and an external electrode disposed on the body and connected to the internal electrode layer. The dielectric layer includes dielectric grains, at least a portion of the dielectric grains has a core-shell structure, and a shell of the core-shell structure contains a rare earth element having an average concentration of more than 0.5 at%. 
     According to an aspect of the present disclosure, a method for producing a capacitor component includes mixing BaTiO 3  and a metal acetate containing dysprosium (Dy) in a solvent, wherein the metal acetate is not dissolved in water; concentrating the mixture to prepare a base material powder; preparing a dielectric green sheet including the base material powder; printing a conductive paste on the dielectric green sheet; laminating a plurality of the printed dielectric green sheets; and sintering the laminate. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
       The above and other aspects, features, and advantages of the present inventive concept will be more clearly understood from the following detailed description, taken in conjunction with the accompanying drawings, in which: 
         FIG.  1    is a view schematically illustrating a capacitor component according to an embodiment; 
         FIG.  2    is a view schematically illustrating a cross section taken along line I-I′ of  FIG.  1   ; 
         FIG.  3    is a TEM-EDS mapping image of region A of  FIG.  2   ; 
         FIG.  4    is a TEM-EDS mapping image illustrating a dysprosium (Dy) concentration (at%) for region A of  FIG.  2   ; 
         FIG.  5    is a diagram schematically illustrating a microstructure of a dielectric layer; 
         FIG.  6    is a graph illustrating breakdown voltages (BDV) of Comparative Example 1, Comparative Example 2, and the Experimental Example; and 
         FIGS.  7 A to  7 C  are graphs illustrating Step-IR evaluation results of Comparative Example 1, Comparative Example 2, and the Experimental Example, respectively. 
     
    
    
     DETAILED DESCRIPTION 
     The following detailed description is provided to assist the reader in gaining a comprehensive understanding of the methods, apparatuses, and/or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatuses, and/or systems described herein will be apparent to one of ordinary skill in the art. The sequences of operations described herein are merely examples, and are not limited to those set forth herein, but may be changed, as will be apparent to one of ordinary skill in the art, with the exception of operations necessarily occurring in a certain order. Also, descriptions of functions and constructions that would be well known to one of ordinary skill in the art may be omitted for increased clarity and conciseness. 
     The features described herein may be embodied in different forms, and are not to be construed as being limited to the examples described herein. Rather, the examples described herein have been provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to one of ordinary skill in the art. 
     Herein, it is noted that use of the term “may” with respect to an embodiment or example, e.g., as to what an embodiment or example may include or implement, means that at least one embodiment or example exists in which such a feature is included or implemented while all examples and examples are not limited thereto. 
     Throughout the specification, when an element, such as a layer, region, or substrate, is described as being “on,” “connected to,” or “coupled to” another element, it may be directly “on,” “connected to,” or “coupled to” the other element, or there may be one or more other intervening elements therebetween. In contrast, when an element is described as being “directly on,” “directly connected to,” or “directly coupled to” another element, there can be no other intervening elements therebetween. 
     As used herein, the term “and/or” includes any one and any combination of any two or more of the associated listed items. 
     Although terms such as “first,” “second,” and “third” may be used herein to describe various members, components, regions, layers, or sections, these members, components, regions, layers, or sections are not to be limited by these terms. Rather, these terms are only used to distinguish one member, component, region, layer, or section from another member, component, region, layer, or section. Thus, a first member, component, region, layer, or section referred to in examples described herein may also be referred to as a second member, component, region, layer, or section without departing from the teachings of the examples. 
     Spatially relative terms such as “above,” “upper,” “below,” and “lower” may be used herein for ease of description to describe one element’s relationship to another element as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, an element described as being “above” or “upper” relative to another element will then be “below” or “lower” relative to the other element. Thus, the term “above” encompasses both the above and below orientations depending on the spatial orientation of the device. The device may also be oriented in other ways (for example, rotated 90 degrees or at other orientations), and the spatially relative terms used herein are to be interpreted accordingly. 
     The terminology used herein is for describing various examples only, and is not to be used to limit the disclosure. The articles “a,” “an,” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms “comprises,” “includes,” and “has” specify the presence of stated features, numbers, operations, members, elements, and/or combinations thereof, but do not preclude the presence or addition of one or more other features, numbers, operations, members, elements, and/or combinations thereof. 
     Due to manufacturing techniques and/or tolerances, variations of the shapes illustrated in the drawings may occur. Thus, the examples described herein are not limited to the specific shapes illustrated in the drawings, but include changes in shape that may occur during manufacturing. 
     The features of the examples described herein may be combined in various manners as will be apparent after gaining an understanding of the disclosure of this application. Further, although the examples described herein have a variety of configurations, other configurations are possible as will be apparent after an understanding of the disclosure of this application. 
     The drawings may not be to scale, and the relative sizes, proportions, and depiction of elements in the drawings may be exaggerated for the purposes of clarity, illustration, and convenience. 
       FIG.  1    is a diagram schematically illustrating a capacitor component according to an embodiment.  FIG.  2    is a diagram schematically illustrating a cross-section taken along line I-I′ of  FIG.  1   .  FIG.  3    is a TEM-EDS mapping image of region A of  FIG.  2   .  FIG.  4    is a TEM-EDS mapping image illustrating a dysprosium (Dy) concentration (at%) for region A of  FIG.  2   .  FIG.  5    is a diagram schematically illustrating a microstructure of a dielectric layer. 
     A capacitor component  100  according to an embodiment includes a body  110  including a dielectric layer  111  and internal electrode layers  121  and  122 ; and external electrodes  130  and  140  disposed on the body  110  and connected to the internal electrode layers  121  and  122 . The dielectric layer  111  includes dielectric grains  11  and  11 ′, and at least a portion  11 ′ of the dielectric grains  11  and  11 ′ has a core  11   b ′ -shell  11   a ′ structure, and the shell  11   a ′ contains a rare earth element with an average concentration of more than 0.5 at%. 
     In the body  110 , the dielectric layer  111  and the internal electrode layers  121  and  122  may be alternately stacked. 
     Although a detailed shape of the body  110  is not particularly limited, as illustrated, the body  110  may have a hexahedral shape or a shape similar thereto. Due to the shrinkage of the ceramic powder included in the body  110  during the sintering process, the body  110  may not have a perfectly straight hexahedral shape, but may have a substantially hexahedral shape. 
     The body  110  may have first and second surfaces  1  and  2  opposing each other in a first direction (T direction), third and fourth surfaces  3  and  4  connected to the first and second surfaces  1  and  2  and opposing each other in a second direction (L direction), and fifth and sixth surfaces  5  and  6  connected to the first and second surfaces  1  and  2 , connected to the third and fourth surfaces  3  and  4 , and opposing each other in a third direction (W direction). 
     The plurality of dielectric layers  111  forming the body  110  are in a sintered state and boundaries between adjacent dielectric layers  111  may be integrated to the extent that they may be difficult to determine without using a scanning electron microscope (SEM). 
     On the other hand, the dielectric layer  111  may include a material having a perovskite structure expressed as ABO 3  as a main component. 
     For example, the dielectric layer  111  may include at least one of BaTiO 3 , (Ba, Ca) (Ti,Ca)O 3 , (Ba,Ca) (Ti,Zr)O 3 , Ba(Ti,Zr)O 3  and (Ba,Ca) (Ti,Sn)O 3 , as a main component. 
     In a more detailed example, the dielectric layer  111  may include, as a main component, one or more selected from the group consisting of BaTiO 3 , (Ba 1-x Ca x ) (Ti 1-y Ca y ) O 3  (where x is 0≤x≤0.3, and y is 0≤y≤0.1), (Ba 1-x Ca x ) (Ti 1-y Zr y )O 3  (where x is 0≤x≤0.3, and y is 0≤y≤0.5), Ba(Ti 1-y Zr y )O 3  (0&lt;y≤0.5) and (Ba 1-x Ca x ) (Ti 1-y Sn y ) O 3  (where x is 0≤x≤0.3, and y is 0≤y≤0.1). 
     The body  110  may include a capacitance formation portion disposed inside the body  110  and including the first internal electrode layer  121  and the second internal electrode layer  122  disposed to face each other with the dielectric layer  111  interposed therebetween such that capacitance is formed therein, and cover portions  113  formed on the upper portion and the lower portion of the capacitance formation portion. 
     The capacitance formation portion is a portion contributing to capacitance formation of the capacitor, and may be formed by repeatedly stacking the plurality of first and second internal electrode layers  121  and  122  with the dielectric layer  111  interposed therebetween. 
     The cover portion  113  may be formed by stacking a single dielectric layer or two or more dielectric layers on the upper and lower surfaces of the capacitance formation portion in the thickness direction, respectively, and basically serves to prevent damage to the internal electrode layer due to physical or chemical stress. 
     The cover portion  113  does not include an internal electrode layer and may include the same material as the dielectric layer  111 . For example, the cover portion  113  may include a ceramic material, for example, a barium titanate (BaTiO 3 )-based ceramic material. 
     In addition, a margin portion may be disposed on a side surface of the capacitance formation portion. The margin portion may be disposed on both sides of the ceramic body  110  in the width direction. The margin portion may basically serve to prevent damage to the internal electrode layer due to physical or chemical stress. 
     The margin portion may be formed by forming an internal electrode layer by applying a conductive paste to the ceramic green sheet except where the margin portion is to be formed. In addition, to suppress the step difference due to the internal electrode layers  121  and  122 , after stacking the internal electrode layers, the internal electrode layers are cut to be exposed to the fifth and sixth surfaces  5  and  6  of the body, and then, a single dielectric layer or two or more dielectric layers are laminated on both side surfaces of the capacitance formation portion in the width direction, thereby forming the margin portion. 
     The internal electrode layers  121  and  122  are alternately stacked with the dielectric layer  111 . The internal electrode layers  121  and  122  may include first and second internal electrode layers  121  and  122 . The first and second internal electrode layers  121  and  122  are alternately disposed to face each other with the dielectric layer  111  constituting the body  110  interposed therebetween, and may be exposed to the third and fourth surfaces  3  and  4  of the body  110 , respectively. 
     Referring to  FIG.  2   , the first internal electrode layer  121  is spaced apart from the fourth surface  4  and exposed through the third surface  3 , and the second internal electrode layer  122  is spaced apart from the third surface  3  and may be exposed through the fourth surface  4 . 
     In this case, the first and second internal electrode layers  121  and  122  may be electrically separated from each other by the dielectric layer  111  interposed therebetween. 
     The body  110  may be formed by alternately stacking a ceramic green sheet on which the first internal electrode layer  121  is printed and a ceramic green sheet on which the second internal electrode layer  122  is printed, followed by sintering. 
     The material for forming the internal electrode layers  121  and  122  is not particularly limited, and a material having excellent electrical conductivity may be used. For example, the internal electrode layers  121  and  122  may be formed by printing a conductive paste for an internal electrode layer, including at least one of nickel (Ni), copper (Cu), palladium (Pd), silver (Ag), gold (Au), platinum (Pt), tin (Sn), tungsten (W), titanium (Ti), and alloys thereof, on a ceramic green sheet. 
     As the printing method of the conductive paste for the internal electrode layer, a screen-printing method or a gravure printing method may be used, but the present disclosure is not limited thereto. 
     Meanwhile, to obtain miniaturization and high capacitance of the multilayer ceramic capacitor, increasing the number of stacks by reducing the thicknesses of the dielectric layer and the internal electrode layers is required, and as the thickness of the dielectric layer and the internal electrode layer decreases, reliability may decrease, and characteristics such as insulation resistance and breakdown voltage may decrease. 
     Accordingly, as the thickness of the dielectric layer and the internal electrode layer decreases, the reliability improvement effect should be highly considered. 
     In detail, when the average thickness of the internal electrode layers  121  and  122  and the average thickness of the dielectric layer  111  are 400 nm or less, the effect of improving high-temperature lifespan characteristics and TCC characteristics according to the present disclosure may be significant. 
     The average thickness of the internal electrode layers  121  and  122  may be measured from an image obtained by scanning a longitudinal-thickness cross-section (L-T cross-section) of the body  110  taken from the central portion of the body  110  in the width direction W with a scanning electron microscope (SEM) . For example, in obtaining the average thickness of the internal electrode layers  121  and  122 , among the internal electrode layers extracted from the image described above, with respect to a total of  5  internal electrode layers including upper two layers and lower two layers, based on one internal electrode layer at the point where the longitudinal center line of the body and the thickness direction center line of the body meet; based on the point where the longitudinal center line and the thickness direction center line of the body meet, five points including left-side two points and right-side two points based on one reference point are determined at equal intervals, and then, the dimension of each point is measured and an arithmetic mean thereof is obtained. For example, the average thickness of the internal electrode layers  121  and  122  may be determined by an average value of the dimensions of a total of 25 points, since with respect to the internal electrode layers of the five layers, the dimensions of respective two points equally spaced (500 nm each) in the left and right directions, based on one point of the internal electrode layer at the point where the longitudinal center line and the thickness direction center line of the body meet, as the one reference point. 
     The average thickness of the dielectric layer  111  may indicate an average thickness of the dielectric layer  111  disposed between the first and second internal electrode layers  121  and  122 . 
     Like the average thickness of the internal electrode layer, the average thickness of the dielectric layer  111  may also be measured by scanning an image of a longitudinal-thickness direction cross-section (L-T cross-section) of the body  110  with a scanning electron microscope (SEM). For example, in obtaining the average thickness of the dielectric layer  111 , among the dielectric layers extracted from the image described above, with respect to a total of 5 dielectric layers including two upper layers and two lower layers, based on one dielectric layer at the point at which the longitudinal center line of the body and the thickness direction center line of the body meet; based on the point at which the longitudinal center line and the thickness direction center line of the body meet, five points including two left-side points and two right-side points based on one reference point are determined at equal intervals, and then, the dimension of each point is measured and an arithmetic mean thereof is obtained. For example, the average thickness of the internal electrode layers  121  and  122  may be determined by an average value of the dimensions of a total of 25 points, since with respect to the internal electrode layers of the five layers, the dimensions of two respective points equally spaced (500 nm each) in the left and right directions, based on one point of the internal electrode layer at the point at which the longitudinal center line and the thickness direction center line of the body meet, as the one reference point, are measured. 
     Referring to  FIG.  5   , the dielectric layer  111  includes a plurality of the dielectric grains  11  and  11 ′, and grain boundaries  11   c  of the dielectric grains  11  and  11 ′ are disposed. At least one of the plurality of dielectric grains is a dielectric grain  11 ′ having a core-shell structure. The dielectric grain  11 ′ having a core-shell structure includes the shell  11   a ′ surrounding at least a portion of the core  11   b ′. 
     A multilayer ceramic capacitor (MLCC), which is one of the capacitor components, tends to have a high capacitance and an ultra-thin layer. Securing the withstand voltage characteristics of the dielectric layer in multilayer ceramic capacitors is emerging as a major problem as the capacitance increases and the thickness is reduced, and an increase in the defect rate due to deterioration of the insulation resistance of the dielectric is also emerging as a problem. 
     To prevent these problems, in the related art, proposed is a method in which rare earth elements such as Dy, Y and Ho are added to suppress the generation of oxygen vacancies and reduce the mobility of oxygen vacancies, and to suppress electrons generated by the addition of a transition metal. 
     As a method of adding an additive element to a dielectric, there are a method (a metal oxide particle dispersion method) of disintegrating and dispersing metal oxide particles having a size of several tens to hundreds of nm, and a method (a sol dispersion method) of dispersing a sol containing an additive element. However, both the metal oxide particle dispersion method and the sol dispersion method have technical limitations in producing a slurry having a stable dispersion state of 10 nm or less. As a result, in the dielectric grain of the related art having a core-shell structure, there is a technical problem in implementing the average concentration of the rare earth element at 0.5 at% or more in the shell. 
     Accordingly, in an embodiment of the present disclosure, at least one of the plurality of dielectric grains has a core-shell structure, and the average concentration of the rare earth element contained in the shell of the core-shell structure may be implemented to be more than 0.5 at%. In the case of the rare earth element, the A site of the perovskite structure basically expressed as ABO 3  is substituted to reduce the concentration of oxygen vacancy vacancies and thereby compose the shell region, and this shell region may act as a barrier that blocks the flow of electrons at the grain boundaries of dielectric grains to function as preventing leakage current. As a result, the concentration of the rare earth element in the shell region may be increased, thereby enhancing the above-described effect. 
     The shell  11   a ′ contains rare earth elements having an average concentration of more than 0.5 at%, based on a total number of atoms in the shell portion. In detail, the shell  11   a ′ contains the rare earth element in an average concentration of 0.7 at% or more. If the average concentration of the rare earth element contained in the shell  11   a ′ is 0.5 at% or less, the reliability improvement effect according to an embodiment of the present disclosure may not be sufficient. As the rare earth element, at least one selected from the group consisting of lanthanum (La), yttrium (Y), actinium (Ac), cerium (Ce), praseodymium (Pr), neodymium (Nd), promethium (Pm), samarium (Sm), europium (Eu), gadolinium (Gd), terbium (Tb), dysprosium (Dy), holmium (Ho), erbium (Er), thulium (Tm), ytterbium (Yb), and ruthenium (Lu) may be used. As a non-limiting example, the shell  11   a ′ may include dysprosium (Dy), but the scope of the present disclosure is not limited thereto. 
     In the core  11   b ′, rare earth elements are not present or exist only in trace amounts if present. 
     Since the concentration of the rare earth element changes rapidly at the boundary between the core  11   b ′ and the shell  11   a ′, the core  11   b ′ and the shell  11   a ′ may be easily distinguished, and the distinguishing therebetween may be confirmed through TEM-EDS analysis. 
     The average concentration of the rare earth element in the shell  11   a ′ may be obtained by performing, for example, line analysis of an Energy Disperse X-Ray Spectrometer (EDS) installed in a transmission electron microscope (TEM) on grains having a core-shell structure. In this case, as illustrated in  FIG.  5   , TEM-EDS line analysis, for example, may be performed on at least four or more lines of the shell  11   a ′, spaced apart from each other, and the average concentration of the rare earth element in the shell  11   a ′ may indicate an arithmetic average value obtained by dividing the analysis dimension for each of the plurality of lines described above by the number of lines. 
     The shell  11   a ′ may be disposed to completely cover the surface of the core  11   b ′. However, the shell  11   a ′ may also be disposed so as not to cover a portion of the surface of the core  11   b ′. In this case, the shell  11   a ′ may be disposed to cover 90 area% or more of the surface of the core. This is because, if the shell  11   a ′ is disposed to cover less than 90 area% of the surface of the core, the effect of improving reliability according to the present disclosure may not be sufficient. The area% coverage of the surface of the core may be measured from an image obtained by scanning a cross section of the dielectric layer with a transmission electron microscope (TEM). 
     On the other hand, referring to  FIG.  5   , the dielectric layer  111  may include dielectric grains  11  not having a core-shell structure in addition to the dielectric grains  11 ′ having a core-shell structure. 
     In this case, the number of dielectric grains  11 ′ having the core-shell structure among the plurality of dielectric grains  11  and  11 ′ may be 50% or more. In this case, the ratio of the number of dielectric grains having a core-shell structure may be measured from an image obtained by scanning a cross section of the dielectric layer with a transmission electron microscope (TEM). 
     If the number of dielectric grains having the core-shell structure among the plurality of dielectric grains is less than 50%, the effect of improving high temperature lifespan characteristics and TCC characteristics may be insufficient. 
     Meanwhile, the size of the dielectric grains does not need to be particularly limited. For example, the average grain size of the dielectric grains may be 50 nm or more and 400 nm or less. 
     If the average grain size is less than 50 nm, there is a risk that the expected effect may be insufficiently implemented due to the lack of solid solution of additional elements due to the decrease in the dielectric constant and the decrease in the grain growth rate, and if the average grain size exceeds 400 nm, there is a fear that the capacitance change rate based on the temperature and DC voltage may increase and reliability may decrease due to a decrease in the number of dielectric grains per dielectric layer. 
     The external electrodes  130  and  140  are disposed on the body  110  and are connected to the internal electrode layers  121  and  122 . 
     As illustrated in  FIG.  2   , the capacitor component  100  may include first and second external electrodes  130  and  140  disposed on the third and fourth surfaces  3  and  4  of the body  110 , respectively, and connected to the first and second internal electrode layers  121  and  122  respectively. 
     Although the structure in which the capacitor component  100  has two external electrodes  130  and  140  is described in this embodiment, the number and shape of the external electrodes  130  and  140  may be changed depending on the shape of the internal electrode layers  121  and  122  or other usage. 
     The external electrodes  130  and  140  may be formed of any material as long as the material has electrical conductivity, such as metal or the like, and a detailed material may be determined in consideration of electrical characteristics and structural stability, and further, the external electrode may have a multilayer structure. 
     For example, the external electrodes  130  and  140  may include first electrode layers  131  and  141  disposed on the body  110 , and second electrode layers  132  and  142  formed on the first electrode layers  131  and  141 . 
     As a more detailed example of the first electrode layers  131  and  141 , the first electrode layers  131  and  141  may be sintered electrodes including a conductive metal and glass, or may be resin-based electrodes including a conductive metal and a resin. In addition, the first electrode layers  131  and  141  may be in a form in which a sintered electrode and a resin-based electrode are sequentially formed on the body  110 . Also, the first electrode layers  131  and  141  may be formed by a method of transferring a sheet including a conductive metal onto the body  110  or transferring a sheet including a conductive metal onto the sintering electrode. 
     As the conductive metal included in the first electrode layers  131  and  141 , a material having excellent electrical conductivity may be used, and the material is not particularly limited. For example, the conductive metal may be at least one of nickel (Ni), copper (Cu), palladium (Pd), silver (Ag), gold (Au), platinum (Pt), tin (Sn), tungsten (W), titanium (Ti), and alloys thereof. 
     The second electrode layers  132  and  142  may be plating layers including at least one of nickel (Ni), tin (Sn), palladium (Pd), and alloys thereof, and may be formed of a plurality of layers. 
     As a more detailed example of the second electrode layers  132  and  142 , the second electrode layers  132  and  142  may be a Ni plating layer or a Sn plating layer, may be in a form in which a Ni plating layer and a Sn plating layer are sequentially formed on the first electrode layers  131  and  141 , or may be in a form in which a Sn plating layer, a Ni plating layer, and a Sn plating layer are sequentially formed. In addition, the second electrode layers  132  and  142  may also include a plurality of Ni plating layers and/or a plurality of Sn plating layers. 
     Experimental Example 
     The ceramic body was manufactured so that dielectric grains of at least a portion of the dielectric layer had a core-shell structure. At this time, Comparative Examples 1 and 2, and Experimental Example were prepared so that the average concentration (at%) of dysprosium (Dy) in the shell was 0.4 at%, 0.5 at%, and 0.85 at%, respectively. 
     In Comparative Examples 1 and 2 and Experimental Example, the base material powder was prepared by an oxide additive method, a nitrate liquid additive synthesis method, and an acetate method, respectively. In detail, in Comparative Example 1, a core-shell dielectric grain base material powder in which a shell of the core-shell structure contains dysprosium (Dy) was prepared by an oxide additive method. In Comparative Example 2, a first solution was prepared by adding dysprosium oxide and nitric acid to an ethanol solvent, a second solution was prepared by adding barium titanate powder and a dispersing agent to the first solution, and the base material powder was prepared by substitution and concentration of the same. In the experimental example, metal acetate containing dysprosium, a dispersing agent, and barium titanate powder were added together in an ethanol solvent and the resultant was concentrated, thereby preparing a base material powder. 
     A dielectric green sheet was manufactured using this base material powder, a conductive paste was printed on the dielectric green sheet, and then, a plurality of the printed dielectric green sheets were laminated to prepare a laminate, followed by sintering, to manufacture a sintered body. 
     In Comparative Examples 1 and 2 and the Experimental Example, except for the above-described base material manufacturing method and the average concentration of dysprosium in the shell of the dielectric grains of the core-shell structure of the sintered body, all other conditions are the same. 
       FIG.  6    is a graph illustrating the Break Down Voltage (BDV) of Comparative Example 1 (#1), Comparative Example 2 (#2), and Experimental Example (#3). For each of Comparative Examples 1 and 2 and Experimental Example, 20 samples were prepared, and Break Down Voltage (BDV) was evaluated. The BDV evaluation was performed while increasing the voltage from 10 mA to 1,100 V. Referring to  FIG.  6   , it can be seen that the average BDV of Experimental Example (#3) is higher than those of Comparative Example 1 (#1) and Comparative Example 2 (#2), respectively. 
       FIGS.  7 A,  7 B, and  7 C  are graphs illustrating Step-IR evaluation results of Comparative Example 1, Comparative Example 2, and Experimental Example, respectively. For each of Comparative Examples 1 and 2 and Experimental Example, 40 samples were prepared, and Step IR evaluation was performed. In Step IR evaluation, at a temperature of 105° C., 1.5 Vr (15 V, 20 V) was applied for the first 12 hours, 2.0 Vr (20 V) was applied for the next 12 hours, 2.5 Vr (25 V) was applied for the next 12 hours, and 3.0 Vr (30 V) was applied for the next 12 hours, thereby measuring changes in insulation resistance (IR) with time for respective samples. Referring to  FIGS.  7  to  9   , it can be seen that the initial IR is relatively high in the case of the Experimental Example as compared with Comparative Examples 1 and 2. In addition, when compared with Comparative Examples 1 and 2, in the case of the Experimental Example, it can be seen that the rate of decrease in IR by 2 orders or more during the first 12 hours is reduced. 
     As set forth above, according to an embodiment, a capacitor component having improved reliability may be provided. 
     While this disclosure includes specific examples, it will be apparent to one of ordinary skill in the art that various changes in form and details may be made in these examples without departing from the spirit and scope of the claims and their equivalents. The examples described herein are to be considered in a descriptive sense only, and not for purposes of limitation. Descriptions of features or aspects in each example are to be considered as being applicable to similar features or aspects in other examples. Suitable results may be achieved if the described techniques are performed to have a different order, and/or if components in a described system, architecture, device, or circuit are combined in a different manner, and/or replaced or supplemented by other components or their equivalents. Therefore, the scope of the disclosure is defined not by the detailed description, but by the claims and their equivalents, and all variations within the scope of the claims and their equivalents are to be construed as being included in the disclosure.