Synthesis of Sm-Co alloys by mechanochemical reduction

Book · Tue Oct 01 04:00:00 EDT 1996

OSTI ID:372082

Richmond, W R; Miao, W F; McCormick, P G ^[1]

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1. Univ. of Western Australia, Nedlands, Western Australia (Australia). Research Centre for Advanced Mineral and Materials Processing

The synthesis of samarium cobalt alloys from SmCl{sub 3} and Co precursor powders by mechanical milling with Ca or Na has been investigated. With Ca as the reductant, an amorphous Sm rich phase formed during milling. Heat treatment above 800 C was required to obtain the SmCo{sub 5} phase. Heat treatment at 700 C enabled the removal of the CaCl{sub 2} by-product in Ca reduced samples without dissolution of sm or an increase in the oxygen content of the samples. Attempts to synthesize SmCo{sub 5} from SmCl{sub 3} and Co using na as the reductant, resulted in a nanocrystalline mixture of Sm, Co and NaCl. Heat treatment in a vacuum of 10{sup {minus}6} Torr resulted in reversion of Sm to SmCl{sub 2} at temperatures above 400 C, while heat treatment in evacuated and sealed silica tubes resulted in the crystallization of Sm-Co intermetallics at high temperatures.

• OSTI ID: 372082
• Report Number(s): CONF-960202--; ISBN 0-87339-312-0
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CALCIUM
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
COBALT ALLOYS
EXPERIMENTAL DATA
FREE ENERGY
HEAT TREATMENTS
INTERMETALLIC COMPOUNDS
MILLING
POWDERS
SAMARIUM ALLOYS
SAMARIUM CHLORIDES
SODIUM
SYNTHESIS
TEMPERATURE DEPENDENCE
WASHING
X-RAY DIFFRACTION