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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.58  No.3 (2017)  >  pp.450-452

MATERIALS TRANSACTIONS
<<Previous article Vol.58  No.3 (2017)   pp.450 - 452 Next article>>

Reassessment of Solid Solubilities and Thermodynamic Properties of Magnesium and Calcium in Silicon

Sakiko Kawanishi1), Takeshi Yoshikawa2)
1) Institute of Multidisciplinary Research for Advanced Materials, Tohoku University 2) Institute of Industrial Science, The University of Tokyo

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)




Keyword:
silicon, magnesium, calcium, solid solubility, temperature-gradient zone melting

Received: September 14, 2016
Accepted: December 05, 2016 , Published online: February 25, 2017

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