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

Chemistry of inorganic compounds – Rare earth compound

Reexamination Certificate

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Details

C423S415100, C423S561100, C423S592100, C252S06230T, C252S06230C

Reexamination Certificate

active

10275963

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 La2S3or 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 La2S3or alpha-phase Ce2S3powder 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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Patent Abstracts of Japan, Publication No. 08-306964, dated Nov. 22, 1996.
Shinji Hirai et al.; J. Am. Ceram. Soc., vol. 81, No. 1, pp. 145-151, 1998.
Practical Manual for New Material Technologies, International Trade and Industry Documentary Research Inc., 1996, p. 904. Discussed in the specification, p. 2.
G.V. Samsonov et al.,Sulfide Manual, Japan Soviet Information Services Inc., 1974, p. 108. Discussed in the specification, p. 2.
S. Kaysuyama et al.,Phase Relation and Thermoelectric Properties of the Ternary Lanthanum Actions Chalcogenide System La-A-S(A=Ca, Ba), Journal of Thermoelectric Conversion Symposium '99, 1999, p. 56. Discussed in the specification, p. 2.
Hirai et al.,Synthesis of Low Oxygen La2O3by Sulphidation of La2O3with CS2, Summary of 124thSpring Seminar of the Japan Institute of Metals, 1999, p. 149. Discussed in the specification, p. 3.
Hirai et al.,Synthesis of γ- La2O3and Thermoelectric Properties, Summary of 125thSpring Seminar of the Japan Institute of Metals, 1999, p. 317.

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