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Title: Improved method for preparing rare earth sesquichalcogenides

An improved method for the preparation of high purity rare earth sesquichalcogenides is described. The rare earth, as one or more pieces of the metal, is sealed under a vacuum with a stoichiometric amount of sulfur or selenium and a small amount of iodine into a quartz reaction vessel. The sealed vessel is then heated to above the vaporization temperature of the chalcogen and below the melting temperature of the rare earth metal and maintained until the product has been formed. The iodine is then vaporized off leaving a pure product. The rare earth sulfides and selenides thus formed are useful as semiconductors and as thermoelectric generators. 3 tables.
Authors:
; ;
Publication Date:
OSTI Identifier:
6771209
Report Number(s):
PATENTS-US--A6368199
ON: DE83006892
DOE Contract Number:
W-7405-ENG-82
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; CERIUM SELENIDES; CHEMICAL PREPARATION; CHEMICAL REACTIONS; ELECTRIC CONDUCTIVITY; SEEBECK EFFECT; CHALCOGENIDES; DYSPROSIUM SULFIDES; GADOLINIUM SULFIDES; LANTHANUM SELENIDES; LUTETIUM SULFIDES; NEODYMIUM SULFIDES; RARE EARTHS; SCANDIUM SULFIDES; SELENIUM; SULFUR; YTTRIUM SULFIDES; EXPERIMENTAL DATA; IODINE; SEMICONDUCTOR MATERIALS; THERMOELECTRIC GENERATORS; VERY HIGH TEMPERATURE; X-RAY DIFFRACTION; CERIUM COMPOUNDS; COHERENT SCATTERING; DATA; DIFFRACTION; DIRECT ENERGY CONVERTERS; DYSPROSIUM COMPOUNDS; ELECTRICAL PROPERTIES; ELEMENTS; GADOLINIUM COMPOUNDS; HALOGENS; INFORMATION; LANTHANUM COMPOUNDS; LUTETIUM COMPOUNDS; MATERIALS; METALS; NEODYMIUM COMPOUNDS; NONMETALS; NUMERICAL DATA; PHYSICAL PROPERTIES; RARE EARTH COMPOUNDS; SCANDIUM COMPOUNDS; SCATTERING; SELENIDES; SELENIUM COMPOUNDS; SEMIMETALS; SULFIDES; SULFUR COMPOUNDS; SYNTHESIS; TRANSITION ELEMENT COMPOUNDS; YTTRIUM COMPOUNDS NESDPS Office of Nuclear Energy Space and Defense Power Systems 400201* -- Chemical & Physicochemical Properties