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. 02, 2010
Filed:
Nov. 30, 2007
Hideo Hosono, Yokohama, JP;
Katsuro Hayashi, Yokohama, JP;
Sung Wng Kim, Yokohama, JP;
Masahiro Hirano, Yokohama, JP;
Satoru Narushima, Chiyoda-ku, JP;
Setsuro Ito, Chiyoda-ku, JP;
Hideo Hosono, Yokohama, JP;
Katsuro Hayashi, Yokohama, JP;
Sung Wng Kim, Yokohama, JP;
Masahiro Hirano, Yokohama, JP;
Satoru Narushima, Chiyoda-ku, JP;
Setsuro Ito, Chiyoda-ku, JP;
Asahi Glass Company, Limited, Tokyo, JP;
Tokyo Institute of Technology, Tokyo, JP;
Abstract
Provided is a method for preparing an electroconductive mayenite type compound with good properties readily and stably at low cost without need for expensive facilities, a reaction at high temperature and for a long period of time, or complicated control of reaction. A method for preparing an electroconductive mayenite type compound comprises a step of subjecting a precursor to heat treatment, wherein the precursor contains Ca and/or Sr, and Al, a molar ratio of (a total of CaO and SrO:AlO) is from (12.6:6.4) to (11.7:7.3) as calculated as oxides, a total content of CaO, SrO and AlOin the precursor is at least 50 mol %, and the precursor is a vitreous or crystalline material; and the method comprises a step of mixing the precursor with a reducing agent and performing the heat treatment of holding the mixture at 600-1,415° C. in an inert gas or vacuum atmosphere with an oxygen partial pressure of at most 10 Pa.