Sakai Chemical Industry Co., Ltd.

Kazuhisa Hidaka

Kazunobu Abe

Masashi Aoki

Shinji Ogama

Yoshiaki Ikeda

Hiroaki Rikimaru

Yukihiro Kuniyoshi

Takeshi Ito

Masami Kuwai

Kayoko Segawa

Takashi Shikida

The invention provides a process for production of powder of perovskite compound which comprises: The process makes it unnecessary to resort to a conventional mechanical crushing means or to make use of impact caused by milling media or airflow, but it makes possible to obtain a powder of perovskite compound which is not contaminated with impurities derived from milling media or chipping particles but has a high purity and a narrow particle size distribution.

Process for production of powder of perovskite compound

The invention provides a process for production of a composition comprising a perovskite structure compound, the process comprising: a first process to heat a hydrous oxide of at least one B group element selected from the group consisting of Ti, Zr, Hf, and Sn at a temperature within a range of 80 to 300&#xb0; C. in the presence of an aqueous medium so as to dehydrate the hydrous oxide; and a second process to heat a reaction product obtained in the first process and a hydroxide of at least one A group element selected from the group consisting of Ba, Sr, Ca, Mg and Pb at a temperature within a range of 100 to 300&#xb0; C. in the presence of an aqueous medium. The process provides a composition comprising an ABOcompound in the form of uniform and fine spherical particles which have an average particle diameter of 1 &#x3bc;m or less, preferably within a range of 0.01 to 0.5 &#x3bc;m, high crystallinity, and a controlled A/B ratio as desired, as well as few internal pores in the crystalline particles.

Process for production of composition

A composition for producing ceramic dielectrics which comprises: a mixture of barium titanate which has average particle size of 0.1-1.5 .mu.m is amounts of 98-60 mole % and a perovskite type barium titanate solid solution which has average particle size of 0.1-1.5 .mu.m and a Curie temperature of 50.degree.-115.degree. C. in amounts of 2-40 mole %; and

Ceramic dielectrics and compositions therefor

A process for producing a composition which includes a perovskite compound, the process comprising:

Process for producing a composition which includes perovskite compounds

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Sakai, Japan

Kazuhisa Hidaka