Patent ID: 6800270
Filing Date: 2004-10-05
Classification: C04B,H01G

Abstract:
A method of production of a dielectric, ceramic composition having at leasta main component expressed by a formula BamTiO2+n, wherein m is 0.995&lE;m&lE;1.010, n 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 first subcomponent containing at least one compound selected from MgO, CaO, BaO, SrO, and Cr2O3, a second subcomponent containing at least one compound selected from SiO2, MO (where M is at least one element selected from Ba, Ca, Sr, and Mg), Li2O, and B2O3, a third subcomponent containing at least one compound selected from V2O5, MoO3, and WO3 and a fourth subcomponent containing an oxide of R (where R is at least one element selected from Y, Dy, Td, Gd, and Ho), wherein the molar ratio of the subcomponents with respect to 100 moles of the main component is first subcomponent: 0.1 to 3, second subcomponent: 2 to 12, third subcomponent: 0.01 to 3, fourth subcomponent: 0.1 to 10.0 (where, in the ratio, the number of moles of the fourth subcomponent is the number of moles of R alone), said method of producing the dielectric ceramic composition comprising the steps of: mixing, in said main component, at least part of other subcomponents except for said second subcomponent to prepare a pre-calcination powder, calcining the pre-calcination powder to prepare a calcined powder, and mixing at least said second subcomponent in said calcinated powder to obtain the dielectric ceramic composition having molar ratios of the subcomponents to the main component of the above ratios.