| 摘要 |
PROBLEM TO BE SOLVED: To obtain the composition having large specific dielectric constant and small dielectric loss by composing essentially of a perovskite type multiple oxide containing Pb, Mg, Nb, Ti and Sn and containing a specific quantity of a Cu compound. SOLUTION: This ceramic composition contains 100 pts.wt. essential component expressed by a formula (2.5<=x<=12.5, 0.05<=y<=0.35) as a composition formula by molar ratio and 0.1-1.0 pts.wt. Cu compound expressed in terms of CuO and Cu forms a solid solution in the perovskite type crystal particle containing Pb, Mg, Nb, Ti and Sn. The ceramic composition is obtained by mixing PbO powder, MgNb2 O6 powder, TiO2 powder, SnO2 powder and the Cu compound powder to have a prescribed composition, molding after calcining at 800-900 deg.C in the atmosphere and firing at 990-1,070 deg.C in an oxidizing atmosphere. A laminated capacitor free from the segregation of the Cu compound in a dielectric layer is obtained by using the ceramic composition as the dielectric layer, laminating Ag-Pd as an internal electrode layer and simultaneously firing at <=1070 deg.C. |
