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Title: Improved method for preparing rare earth sesquichalcogenides

Abstract

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.

Inventors:
; ;
Publication Date:
OSTI Identifier:
6771209
Alternate Identifier(s):
OSTI ID: 6771209; Legacy ID: DE83006892
Patent Number(s):
PATENTS-US--A6368199
Application Number:
ON: DE83006892
Assignee:
OSTI; ERA-08-018344; EDB-83-050976
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

Citation Formats

Takeshita, T., Beaudry, B.J., and Gschneidner, K.A. Jr.. Improved method for preparing rare earth sesquichalcogenides. United States: N. p., 1982. Web.
Takeshita, T., Beaudry, B.J., & Gschneidner, K.A. Jr.. Improved method for preparing rare earth sesquichalcogenides. United States.
Takeshita, T., Beaudry, B.J., and Gschneidner, K.A. Jr.. Wed . "Improved method for preparing rare earth sesquichalcogenides". United States. doi:. https://www.osti.gov/servlets/purl/6771209.
@article{osti_6771209,
title = {Improved method for preparing rare earth sesquichalcogenides},
author = {Takeshita, T. and Beaudry, B.J. and Gschneidner, K.A. Jr.},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Apr 14 00:00:00 EST 1982},
month = {Wed Apr 14 00:00:00 EST 1982}
}

Patent:

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  • A method for preparing rare earth sulfides by sulfurizing the rare earth oxides with a mixture of carbon disulfide and inert gas is described. (OTS)
  • Permanent magnetic alloys are described which comprise 11.5-12.5% rare earth components of which 6.3-12% is samarium and 0.5-6.2% is yttrium; 2-2.5% hafnium, 19.5-26.5% iron, 7-10.5% copper, and 52-70.7% cobalt, the ranges of the components being in atomic ratios. The alloys are prepared by obtaining 1-50 mu M. Powders of the components, compacting the powder after magnetic field orientation sintering the compacted powders at 1160/sup 0/-1220/sup 0/ for 1-10 hours, cooling the sintered body at a rate of at least 1/sup 0/C./second until the temperature is about 900/sup 0/ C., and then annealing the body at 750/sup 0/-900/sup 0/ C.
  • Insertion of light elements such as H,C, or N in the R.sub.2 Fe.sub.17 (R=rare earth metal) series has been found to modify the magnetic properties of these compounds, which thus become prospective candidates for high performance permanent magnets. The most spectacular changes are increases of the Curie temperature, T.sub.c, of the magnetization, M.sub.s, and of coercivity, H.sub.c, upon interstitial insertion. A preliminary product having a component R--Fe--C,N phase is produced by a chemical route. Rare earth metal and iron amides are synthesized followed by pyrolysis and sintering in an inert or reduced atmosphere, as a result of which, the R--Fe--C,Nmore » phases are formed. Fabrication of sintered rare earth iron nitride and carbonitride bulk magnet is impossible via conventional process due to the limitation of nitridation method.« less
  • This paper describes a method for producing permanent magnets. It comprises: mixing a particulate alloy containing at least one light rare earth metal, iron, boron, a ferromagnetic metal selected from the group consisting of nickel, cobalt, and mixtures thereof, with at least one particulate metal additive containing a heavy lanthanide metal, the particulate alloy comprising a main magnetic phase having an empirical formula of about ND{sub 2}(Fe + Co){sub 14}B' aligning magnetic domains of the mixture in a magnetic field; compacting the aligned mixture to form a shape; and sintering the compacted shape for sufficient time to produce the permanentmore » magnets having the heavy lanthanide metal near the grain boundaries of particles of the main magnetic phase.« less