Nonreducible Mechanism of {(Ba1-xCax)O}mTiO2 (m>1) Ceramics
Nonreducible Mechanism of {(Ba1-xCax)O}mTiO2 (m>1) Ceramics
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{(Ba1-xCax)O}mTiO2 (m>1)陶瓷的不可还原机理
DOI：
10.1143/jjap.41.6461
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发表时间：
2002
影响因子：
1.5
通讯作者：
H. Takagi
中科院分区：
文献类型：
--
作者：
Y. Sakabe;H. Takagi
通过测量高温下不同气氛下的电导率，研究了{（Ba_（1-x）Ca_x）O} mTiO_2（m>1）陶瓷在还原气氛中烧结的非还原机理。Ca掺杂的BaTiO 3陶瓷的高绝缘电阻可以由以下三个因素解释：（1）由于Ca ~（2+）离子取代Ti ~（4+）位，降低了晶格中的电子浓度;（2）由于Ca ~（2+）离子取代Ba ~（2+）位，使还原反应的热焓变高;（3）由于Ca ~（2+）离子在Ti ~（4+）位上形成高浓度的氧空位，平衡反应的凝固温度较低。
The nonreducible mechanism of {(Ba1-xCax)O}mTiO2 (m>1) ceramics fired in a reducing atmosphere was investigated by measuring the electrical conduction under various atmospheres at elevated temperatures. The high insulation resistance of the Ca-doped BaTiO3 ceramics can be explained by the following three factors; (1) the decrease of electron concentration in the lattice by the substitution of Ca2+ ions for the Ti4+ site, (2) the high enthalpy change of the reduction reaction by the substitution of Ca2+ ions for the Ba2+ site, and (3) the low freezing temperature of the equilibrium reaction due to high concentration of the extrinsic oxygen vacancies developed by Ca2+ ions on the Ti4+ site.