Thermodynamic properties of molybdenum silicides by molten electrolyte EMF measurements

被引：0
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作者：
Fujiwara, Hiroyasu [1 ]
Ueda, Yukitomi [1 ]
机构：
[1] Graduate School of Energy Science, Kyoto University, Yoshida-honmachi, Sakyo-ku, Kyoto, 606-8501, Japan
来源：
Journal of Alloys and Compounds | 2007年 / 441卷 / 1-2期
关键词：
EMF measurements on silicon concentration cell were carried out using molten lithium silicate electrolyte in the temperature range 1305-1507 K. Using the EMF-temperature relations; the standard free energies of formation for Mo3Si; Mo5Si3 and MoSi2 have been obtained as functions of temperature: ΔfG° (Mo3Si) (kJ mol-1) = -122.1 + 0.0027T (K) ± 0.15; ΔfG° (Mo5Si3) (kJ mol-1) = -312.9 - 0.0064T (K) ± 0.26 and ΔfG° (MoSi2) (kJ mol-1) = -146.3 + 0.0096T (K) ± 0.22; respectively. Combining the results with thermodynamic data; the standard enthalpies of formation for these silicides at 298 K have been calculated as ΔfH° (Mo3Si; 298) (kJ mol-1) = -122.1 ± 6.0; ΔfH°; (Mo5Si3; 298) (kJ mol-1) = -313.5 ± 12.0 and ΔfH° (MoSi2; 298) (kJ mol-1) = -135.8 ± 4.5; respectively. © 2006 Elsevier B.V. All rights reserved;
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页码：168 / 173
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