| 摘要 |
PURPOSE:To provide a dielectric ceramic material practically sufficient in the microwave dielectric characteristics such as dielectric constant, a dielectric loss a resonance frequency temperature coefficient and capable of lowering firing temperature and also provide multilayer ceramic parts having excellent characteristics such as high Q-value as a resonator. CONSTITUTION:A dielectric ceramic material has such constituents that when the main component is expressed by a composition formula xBaO.yTiO2.zNd2O3, there is a relation 7<=x<=25, 55<=y<=78 and 10<=z<=25 where x+y+z=100mol%, and BiO2O3 0 to 15wt.%, MnO 0.5 to 1.5wt.%, glass 4 to 25wt.% are added to the main component. Further, in the case a dielectric ceramic material and an inner conductor material are simultaneously fired so as to obtain a multilayer ceramic part, firing is performed desirbly at higher temperature than a melting point of the inner conductor material and under the condition of oxygen partial pressure not exceeding 5X10<-2>atm. |
