Preparation and processing of rare earth chalcogenides

Journal Article · Thu Oct 01 04:00:00 EDT 1998 · Journal of Materials Engineering and Performance

DOI:https://doi.org/10.1361/105994998770347521· OSTI ID:669813

Gschneidner, Jr, K A ^[1]

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1. Ames Lab., IA (United States)

Rare earth chalcogenides are initially prepared by a direct combination of the pure rare earth metal and the pure chalcogen element with or without a catalyst. The use of iodine (10 to 100 mg) as a fluxing agent (catalyst), especially to prepare heavy lanthanide chalcogenides, greatly speeds up the formation of the rare earth chalcogenide. The resultant powders are consolidated by melting, pressure assisted sintering (PAS), or pressure assisted reaction sintering (PARS) to obtain near theoretical density solids. Mechanical alloying is a useful technique for preparing ternary alloys. In addition, mechanical alloying and mechanical milling can be used to form metastable allotropic forms of the yttrium and heavy lanthanide sulfides. Chemical analysis techniques are also described because it is strongly recommended that samples prepared by melting should have their chemical compositions verified because of chalcogen losses in the melting step.

• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 669813
• Journal Information: Journal of Materials Engineering and Performance, Journal Name: Journal of Materials Engineering and Performance Journal Issue: 5 Vol. 7; ISSN 1059-9495; ISSN JMEPEG
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CATALYSTS
CHEMICAL ANALYSIS
CHEMICAL PREPARATION
IODINE
MILLING
RARE EARTH COMPOUNDS
SINTERING
SULFIDES