チタン酸バリウム微粒子の構造と誘電性
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Fine particles of high-purity barium titanate from a minimum of 500A upwards were prepared. by the thermal decomposition of barium titanyl oxalates, BaTiO(C<SUB>2</SUB>O<SUB>4</SUB>)<SUB> 2</SUB>⋅4H<SUB>2</SUB>0, at 600-1100°C. The effective dielectric constant was measured with the particles dispersed in Araldite resin. The following results are of interest: (1) In the case of fine particles of 500-700A, the effective dielectric constant delineates a smooth curve with temperature and the ferroelectric Curie peak moves to low temperature. (2) From X-ray diffraction analysis, the tetragonality decreased with decreasing particle size, thus leading to cubic symmetry.<BR>A brief discussion was given to the correlation between the decrease in tetragonality and the shift of the Curie point.
- 社団法人 粉体粉末冶金協会の論文
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