The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 30, 2013
Filed:
Feb. 25, 2005
Yoshiaki Ikeda, Iwaki, JP;
Masami Kuwai, Iwaki, JP;
Shinji Ogama, Iwaki, JP;
Yukihiro Kuniyoshi, Sakai, JP;
Kazuhisa Hidaka, Sakai, JP;
Yoshiaki Ikeda, Iwaki, JP;
Masami Kuwai, Iwaki, JP;
Shinji Ogama, Iwaki, JP;
Yukihiro Kuniyoshi, Sakai, JP;
Kazuhisa Hidaka, Sakai, JP;
Sakai Chemical Industry Co., Ltd., Osaka, JP;
Abstract
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° 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° 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 μm or less, preferably within a range of 0.01 to 0.5 μm, high crystallinity, and a controlled A/B ratio as desired, as well as few internal pores in the crystalline particles.