发明授权
- 专利标题： Sintered compact of lanthanum sulfide or cerium sulfide and method for preparing the same
- 专利标题（中）： 硫化镧或硫化铈的烧结体及其制备方法
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申请号： US10275963申请日： 2000-11-17
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公开(公告)号： US07186391B1公开(公告)日： 2007-03-06
- 发明人: Yoichiro Uemura , Mamoru Mitomo , Toshiyuki Nishimura , Shinji Hirai , Kazuyoshi Shimakage
- 申请人： Yoichiro Uemura , Mamoru Mitomo , Toshiyuki Nishimura , Shinji Hirai , Kazuyoshi Shimakage
- 申请人地址： JP Saitama JP Ibaraki
- 专利权人： Japan Science and Technology Agency,National Institute for Materials Science
- 当前专利权人： Japan Science and Technology Agency,National Institute for Materials Science
- 当前专利权人地址： JP Saitama JP Ibaraki
- 代理机构： Westerman, Hattori, Daniels & Adrian, LLP.
- 优先权： JP2000-152779 20000519
- 国际申请： PCT/JP00/08150 WO 20001117
- 国际公布： WO01/87799 WO 20011122
- 主分类号： C01B17/00
- IPC分类号： C01B17/00 ; C01F1/00 ; C01F17/00 ; H01L35/00
摘要：
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 La2S3 or Ce2S3, 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 La2S3 or alpha-phase Ce2S3 powder 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.
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