BaTiO_3-Sr_2Bi_4Ti_5O_<18>混晶系誘電体とその応用 : 物性・応用
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概要
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The dielectric composition BaTiO_3-Sr_2Bi_4Ti_5O_<18> fired at 100°-1500℃ has excellent C-V characteristics and a high insulation resistance at 125℃. The composition 95 mol% BaTiO_3-5 mol% Sr_2Bi_4Ti_5O_<18> exhibits a 1800 relative dielectric constant, a 1.0% dissipation factor and so weak temperature dependence of capacitance that designates EIA ( Electronic Industries Association)-X 7 R. The fracture surface of the multilayer ceramic capacitor (MLCC) using this dielectric composition and 70 Ag/30Pd internal electrode shows grain boundaries between the internal electrodes, while that of this dielectric body itself does not show. Consequently the insulation resistance of the MLCC fired at air atmosphere degraded in the accelerated humidity load test. The use of Pt for the electrode at MLCC is effective to prevent the influence of Ag/Pd on the dielectric body. It is found even if electrode is formed with 70 Ag・30 Pd material, when the MLCC is fired in weak reducing atmosphere, the above influence of the metal on the dielectric body is prevented.
- 社団法人日本セラミックス協会の論文
- 1990-08-01