Partial pressures for several In-Se compositions from optical absorbance of the vapor |
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Authors: | R F Brebrick and Ching-Hua Su |
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Affiliation: | (1) Materials Science and Engineering Program, College of Engineering, Marquette University, 53233 Milwaukee, WI;(2) Microgravity Science and Applications Department SD47, Science Directorate, National Aeronautics and Space Administration, Marshall Space Flight Center, 35812 Huntsville, AL |
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Abstract: | The optical absorbance of the vapor phase over various In-Se compositions between 33.3–60.99 at.% Se and 673–1418 K was measured
and used to obtain the partial pressures of Se2(g) and In2Se(g). The results are in agreement with silica Bourdon gauge measurements for compositions between 50–61 at.%, but significantly
higher than those from Knudsen cell and simultaneous Knudsen-torsion cell measurements. It is found that 60.99 at.% Se lies
outside the sesquiselenide homogeneity range and 59.98 at.% Se lies inside and is the congruently melting composition. The
Gibbs energy of formation of the liquid from its pure liquid elements between 1000–1300 K is essentially independent of temperature
and falls between −36 to −38 kJ per g atomic weight for 50 and 56% Se at 1200 and 1300 K. |
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