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:
Mar. 07, 1989
Filed:
Jun. 24, 1987
Satoru Uedaira, Kanagawa, JP;
Masayuki Suzuki, Kanagawa, JP;
Hiroshi Yamanoi, Kanagawa, JP;
Hidemasa Tamura, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
A method for manufacturing fine powders of lead titanate which includes the steps of reacting a water-soluble titanium compound or the hydrolysis product of a titanium compound with a lead compound in an aqueous alkaline solution having a pH value not less than 11.2, at a temperature not less than 100.degree. C. to obtain a precipitate of lead titanate fine powder, and then recovering the lead titanate fine powder from the remaining solution. By adjusting the pH and the synthesis temperature at proper values, it is possible to synthesize different forms of lead titanate, including a perovskite structure, a pyrochlore structure, or acicular (needle-like) crystals with a novel crystal phase. The acicular fine lead titanate crystals have an X-ray diffraction peak at 2.theta.=30.71.degree. using a copper target.