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. 06, 2007
Filed:
Nov. 17, 2000
Yoichiro Uemura, Ushiku, JP;
Mamoru Mitomo, Ushiku, JP;
Toshiyuki Nishimura, Tsukuba, JP;
Shinji Hirai, Muroran, JP;
Kazuyoshi Shimakage, Muroran, JP;
Yoichiro Uemura, Ushiku, JP;
Mamoru Mitomo, Ushiku, JP;
Toshiyuki Nishimura, Tsukuba, JP;
Shinji Hirai, Muroran, JP;
Kazuyoshi Shimakage, Muroran, JP;
Japan Science and Technology Agency, Saitama, JP;
National Institute for Materials Science, Ibaraki, JP;
Abstract
The present invention provides a lanthanum sulfide or cerium sulfide sintered compact usable as a thermoelectric conversion material having a high Seebeck coefficient. The sintered compact has a chemical composition of LaSor CeS, and a crystal structure consisting of a mixture of beta and gamma phases having a Seebeck coefficient higher than that of the crystal structure otherwise being in gamma single-phase. The sintered compact is produced by preparing a beta-phase LaSor alpha-phase CeSpowder of raw material having a high purity with a suppressed carbon impurity concentration and a given range of oxygen concentration, charging the raw material into a carbon die having an inner surface covered with an h-BN applied thereon, and hot-pressing the charged material under vacuum to form a mixture of beta and gamma phases having a high Seebeck coefficient.