Patent ID: 6485672
Filing Date: 2002-11-26
Classification: C04B,H01G

Abstract:
A method of manufacturing a dielectric ceramic composition comprising:a main component expressed by the formula BamTiO2+n, wherein the â€œmâ€  in the formula is 0.995&lE;m&lE;1.010, â€œnâ€  is 0.995&lE;n&lE;1.010, and the ratio of Ba and Ti is 0.995&lE;Ba/Ti&lE;1.010, a second subcomponent including a sintering aid containing silicon oxide as a main component, and other subcomponents, comprising the steps of: mixing the main component and at least part of the subcomponents except the second subcomponent to prepare a pre-calcination powder, calcining the pre-calcination powder to prepare a calcined powder, and mixing at least the second subcomponent in said calcined powder to obtain a dielectric ceramic composition having ratios of the subcomponents to the main component of predetermined molar ratios, wherein said other subcomponents include at least: a first subcomponent including at least one type of compound selected from MgO, CaO, BaO, SrO, and Cr2O3, a third subcomponent including at least one type of compound selected from V2O5 MoO3, and WO2, and a fourth subcomponent including an oxide of R (where, R is at least one type of element selected from Y, Dy, Tb, Gd, and Ho); and at least the second subcomponent is mixed in the calcined powder to obtain a dielectric ceramic composition having ratios of the subcomponents to 100 moles of the main component of: the first subcomponent: 0.1 to 3 moles, the second subcomponent: 2 to 12 moles, the third subcomponent: 0.1 to 3 moles, and the fourth subcomponent: 0.1 to 10.0 moles (where, the number of moles of the fourth subcomponent is the ratio of R by itself), and said pre-calcination powder is prepared and calcined so that the molar ratio of the components contained in the pre-calcination powder becomes a (Ba+metal element of the first subcomponent)/(Ti+metal element of the fourth subcomponent) of less than 1 or a (Ba+metal element of the fourth subcomponent)/(Ti+metal element of the first subcomponent) of more than 1.