Sintered compact of lanthanum sulfide or cerium sulfide and...

C - Chemistry – Metallurgy – 04 – B

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C04B 35/547 (2006.01) H01L 35/16 (2006.01)

Patent

CA 2411020

A sintered compact of lanthanum sulfide or cerium sulfide having a chemical composition of La2S3 or Ce2S3, respectively, characterized as having a crystal structure of a mixed phase of .beta.-phase and .gamma.-phase and exhibiting a Seebeck coefficient being greater than that of .gamma. single phase; and a method for preparing the sintered compact which comprises providing a powdery law material of .beta.-phase La2S3 or .alpha.-phase Ce2S3, each having a high purity with a suppressed carbon impurity concentration and a predetermined range of oxygen concentration, charging the law material into a carbon mold having a h-BN coating applied on the internal surface thereof, and subjecting the material to hot pressing in vacuo, to thereby form a mixed phase of .beta.- phase and .gamma.-phase having a great Seebeck coefficient. The sintered compact can be used as a heat-electricity converting material having a great Seebeck coefficient.

L'invention concerne un compact fritté de sulfure de lanthane ou de sulfure de cérium dont la composition chimique est La¿2?S¿3? ou Ce¿2?S¿3?, se caractérisant par sa structure cristalline à phase mélangée de phase .beta. et de phase .gamma. et présentant un coefficient de Seebeck supérieur à celui de la phase unique .gamma.. L'invention concerne également un procédé de préparation du compact fritté consistant à utiliser une matière première en poudre de phase .beta. La¿2?S¿3? ou de phase .alpha. Ce¿2?S¿3?, chacune de haute pureté grâce à la suppression d'une concentration d'impuretés de carbone et une gamme prédéterminée de concentration d'oxygène ; à charger la matière première dans un moule de carbone comprenant un revêtement h-BN appliqué sur sa surface interne ; et à soumettre la matière à un pressage à chaud sous vide afin de former une phase mélangée de phase .beta. et de phase .gamma. possédant un haut coefficient de Seebeck. Le compact fritté peut être utilisé comme matière de conversion chaleur-électricité à haut coefficient de Seebeck.

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