MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Reassessment of Solid Solubilities and Thermodynamic Properties of Magnesium and Calcium in Silicon
Sakiko KawanishiTakeshi Yoshikawa
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2017 Volume 58 Issue 3 Pages 450-452

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Abstract

To obtain fundamental knowledge on the behavior of magnesium (Mg) and calcium (Ca) in solid silicon (Si) during solidification, the solid solubilities of Mg and Ca in Si were reinvestigated by temperature-gradient zone melting method. Solubilities were measured to be 0.0016–0.0041 mol% for Mg and 0.0006–0.0021 mol% for Ca at 1373–1623 K. The excess Gibbs energies of Mg and Ca in solid Si were determined from their solid solubilities as follows:

RT ln γ°Mg(s)in solid Si=193,000(±52,000)-69.8(±34)T (J/mol)

RT ln γ°Ca(s)in solid Si=140,000(±35,000)-72.6(±23)T (J/mol)

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© 2017 The Japan Institute of Metals and Materials
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