金属アルコキシド法によるNb_2O_5-コーティングBaTiO_3複合粒子の合成と評価
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概要
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Chemical processing of Nb<SUB>2</SUB>O<SUB>5</SUB>-added BaTiO<SUB>3</SUB> composites was investigated with the surface modification through the hydrolysis of niobium alkoxide on the surface of BaTiO<SUB>3</SUB> particles.<BR>BaTiO<SUB>3</SUB> particles were coated with niobium hydroxide particles formed by preferential hydrolysis of niobium pentaethoxide on the surfaces of BaTiO<SUB>3</SUB> particles, which can lead to the preparation of highly homogeneous composite particles of Nb<SUB>2</SUB>O<SUB>5</SUB>BaTiO<SUB>3</SUB>.<BR>It was clarified from the BET measurement, the SEM&TEM observation and Zeta-potential measurment that original BaTi0<SUB>3</SUB> particles were homogeneously coated with niobium hydroxide particles.<BR>Iwt%Nb<SUB>2</SUB>O<SUB>5</SUB>-added BaTiO<SUB>3</SUB> bodies sintered at 1250-1300°C exhibited a flattened dielectric temperature dependence (dielectric constants of 2200 to 2400) with lower loss(tan δ<1.0%) in the temperature range of -30 to 80°C, indicating a relaxor characteristics. The microstructure of Nb<SUB>2</SUB>O<SUB>5</SUB>-added BaTiO<SUB>3</SUB> sintered bodies consisted of grains of several μ m which are much smaller than ones of non-added BaTiO<SUB>3</SUB> sintered bodies, suggesting that the grain growth of BaTiO<SUB>3</SUB> was inhibited by niobium existing at the grain boundaries.
- 社団法人 粉体粉末冶金協会の論文
- 1995-09-15
著者
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林 卓
Department Of Materials Science Shonan Institute Of Technology
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林 卓
湘南工科大
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Hayashi Takafumi
Department Of Applied Physics Faculty Of Engineering The University Of Tokyo
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Hayashi Takayoshi
Advanced Research Institute For Science And Engineering Waseda University
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安島 香緒里
湘南工科大学材料工学科
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伊藤 岳英
湘南工科大学材料工学科
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佐々木 〓一
旧デュポン社
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