Thermodynamic properties of aluminum, magnesium, and calcium in molten silicon

Journal Article · Thu Oct 01 04:00:00 EDT 1998 · Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science

DOI:https://doi.org/10.1007/s11663-998-0073-3· OSTI ID:670001

Miki, Takahiro; Morita, Kazuki ^[1]; Sano, Nobuo ^[1]

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1. Univ. of Tokyo (Japan). Dept. of Metallurgy

The thermodynamic properties of aluminum, magnesium, and calcium in molten silicon were investigated using a chemical equilibration technique at 1723 to 1848 K, 1698 to 1798 K, and 1723 to 1823 K, respectively. The activity coefficient of aluminum in molten silicon was determined by equilibrating molten silicon-aluminum alloys with solid Al{sub 2}O{sub 3} and Al{sub 6}Si{sub 2}O{sub 13}, that of magnesium was determined by equilibrating molten silicon-magnesium alloys and MgO-SiO{sub 2}-Al{sub 2}O{sub 3} melts doubly saturated with MdSiO{sub 3} and SiO{sub 2}, and that of calcium was determined by equilibrating molten silicon-calcium alloys with SiO{sub 2}-saturated CaO-SiO{sub 2} melts. The activity coefficients at infinite dilution relative to the pure liquid state were determined as follows: log {gamma}{sub Al({ell})in Si}{sup o} = {minus} 1570/T + 0.236, (1723 to 1848 K); log {gamma}{sub Mg({ell}) in Si}{sup o} = {minus} 4900/T + 1.96, (1698 to 1798 K); and log {gamma}{sub Ca({ell})in Si}{sup o} = {minus} 7670/T + 1.53, (1723 to 1823 K).

• Sponsoring Organization: USDOE
• OSTI ID: 670001
• Journal Information: Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science, Journal Name: Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science Journal Issue: 5 Vol. 29; ISSN MTBSEO
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
CALCIUM ALLOYS
IMPURITIES
LIQUID METALS
MAGNESIUM ALLOYS
SILICON ALLOYS
SILICON SOLAR CELLS
THERMODYNAMIC PROPERTIES