Change from Metastable Cubic to Stable Tetragonal Form of Submicron Barium Titanate

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概要

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• The change from metastable cubic to stable tetragonal form was investigated on the submicron BaTiO<SUB>3</SUB> which was prepared by the hydrolysis of titanium tetraisopropoxide in barium hydroxide solution and by crystallization in the glass of BaO–TiO<SUB>2</SUB>–SiO<SUB>2</SUB>–Al<SUB>2</SUB>O<SUB>3</SUB> system. The precipitated BaTiO<SUB>3</SUB> was found to be the aggregates of minute grains of about 100 Å, to have large amount of strain and to absorb about 6% of OH and alcoholic radicals, some of them absorbed chemically. It is in a metastable cubic form. After the heating above 800 °C, it changed to stable tetragonal form in association with weight loss and decrease in lattice strain. The samples heated at 800–900 °C did not show the Curie point on the DTA curve although they were tetragonal. The samples heated at 1300 °C had the Curie point about 122 °C. The glass-devitrified BaTiO<SUB>3</SUB> was also cubic and had large lattice strain. In order to change to tetragonal form, the heating above 1000 °C was needed. The metastable cubic form of submicron BaTiO<SUB>3</SUB> seemed to be stabilized by the absorbants on the surface which balanced with large amount of strain in the lattice.

• 公益社団法人 日本化学会の論文

著者

• Inagaki Michio

  Faculty Of Engineering Aichi Institute Of Technology

• Nakakita Fumihiko

  Faculty of Engineering, Nagoya University

• Naka Shigeharu

  Faculty of Engineering, Nagoya University

• Suwa Yoshiko

  Faculty of Engineering, Nagoya University

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