日本金属学会誌

J. Japan Inst. Metals, Vol. 59, No. 1 (1995),
pp. 37-43

Oxygen Solubility in Liquid Gallium and Liquid Indium

Takayuki Narushima, D. Sajuti, Katsuyuki Saeki,Shin-ya Yoshida and Yasutaka Iguchi

Department of Metallurgy, Faculty of Engineering, Tohoku University, Sendai

Abstract:

The oxygen solubility in liquid gallium or liquid indium equilibrated with solid Ga2O3 or In2O3, respectively, was determined in an alumina crucible which was less reactive than the silica one. After establishment of an equilibrium between the liquid metal (gallium or indium) and an oxide (Ga2O3 or In2O3) formed on the surface of the metal during melting, the oxygen content in quenched gallium or indium was analyzed by the inert gas fusion-IR absorption method. The optimum conditions for oxygen extraction were decided for a furnace power and a bath composition. The temperature dependence of oxygen solubility in liquid gallium or liquid indium was expressed as the following equations:
\begin{equation*}
log (C\underline{O}/mass% in liquid gallium)=-6200/T+2.61(± 0.119) (T: 1123{~}1523 K),
\end{equation*}
\begin{equation*}
log (C\underline{O}/mass% in liquid indium)=-6600/T+3.77(± 0.074) (T: 1073{~}1373 K).
\end{equation*}

Using the temperature dependence of the oxygen solubility in the present work and the standard free energy of formation of Ga2O3 or In2O3 in the literature, the standard free energy change for oxygen dissolution in liquid gallium or liquid indium could be represented as follows:

\begin{equation*}
1/2O2(g)=\underline{O}(mass%, in liquid gallium),
\end{equation*}
\begin{equation*


(Received August 3, 1994)

Keywords:

gallium, indium, oxygen solubility, thermodynamics, equilibrium, liquid encapsulated Czochralski method


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