Patent ID: 6544916
Filing Date: 2003-04-08
Classification: C04B,H01G

Abstract:
A method of manufacturing a dielectric ceramic composition, including at least:a main component constituted by barium titanate has a composition expressed by BamTiO2+m where m is 0.995&lE;m&lE;1.010 and a ratio of Ba and Ti is 0.995&lE;Ba/Ti&lE;1.010; a second subcomponent as a sintering aid and having a ratio of 2 to 10 moles with respect to 100 moles of the main component, said second subcomponent containing SiO2 as a main component and at least one type selected from MO (note that M is at least one type of element selected from Ba, Ca, Sr and Mg), Li2O and B2O3; and other subcomponents comprising at least: a first subcomponent containing at least one type selected from MgO, CaO, BaO, SrO and Cr2O3; a third subcomponent containing at least one type selected from V2O5, MoO3 and WO3; and a fourth subcomponent containing an oxide of R1 (note that R1 is at least one type selected from Sc, Er, Tm, Yb and Lu; comprising the steps of: mixing in said main component at least part of other subcomponents except for the second subcomponent to prepare a pre-calcination powder; calcining said pre-calcination powder to prepare a calcined powder; and mixing at least said second subcomponent in said calcined powder to obtain a dielectric ceramic composition having ratios of the respective subcomponents with respect to 100 moles of the main component being predetermined molar ratios which are: the first subcomponent: 0.1 to 3 moles, the third subcomponent: 0.01 to 0.5 mole, and the fourth subcomponent: 0.5 to 7 moles (where, the number of moles of the fourth subcomponent is the ratio of R1 by itself).