Abstract: A ceramic molded body obtained by molding a raw material powder having a mean grain size of about 1 &mgr;m or less and a BET specific surface area of about 5 m2/g or more is fired in an atmosphere of about 95% or higher oxygen concentration at a temperature higher than an ordinary firing temperature for a time shorter than an ordinary time, whereby the sintering can be completed in a short time.

Abstract: The present invention is a dielectric ceramic composition capable forming a dielectric resonator device provided with a high Q value at a high frequency band and keep a stable crystal phase when operated at a high power applied field. The dielectric ceramic composition which comprises a base composition expressed by the following chemical formula;BaO-x{(1-y)TiO.sub.2.yZrO.sub.2 };wherein 4.300.ltoreq.x.ltoreq.4.450 0<y.ltoreq.0.10 andand additives of MnO.sub.2 and Ta.sub.2 O.sub.5 in the following weight ratio against the base composition;0<MnO.sub.2 .ltoreq.0.5 wt. %0<Ta.sub.2 O.sub.5 .ltoreq.1.2 wt.