| 摘要 |
A dielectric ceramic material is represented by the following compositional formula, (100-a)[Ba<SUB>u</SUB>{(Zn<SUB>v</SUB>Co<SUB>1-v)w</SUB>Nb<SUB>x</SUB>}O<SUB>delta1</SUB>]-a[M<SUB>y</SUB>Ta<SUB>z</SUB>O<SUB>delta2</SUB>], where M represents at least one species selected from K, Na, and Li. In one method, the dielectric material is produced by mixing raw material powders such that proportions by mol of component metals simultaneously satisfy the relations, 0.5<=a<=25; 0.98<=u<=1.03; 0<=v<=1; 0.274<=w<=0.374; 0.646<=x<=0.696; 0.5<=y<=2.5; and 0.8<=z<=1.2. The method further includes subjecting the resultant mixture to primary pulverization; calcining the resultant powder at 1,100-1,300° C., followed by wet secondary pulverization; drying the resultant paste; granulating; molding the resultant granules to thereby yield a compact; and firing the compact in air advantageously at 1,400-1,600° C.
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