Determination of Standard Gibbs Energies of Formation of FeWO4 and Fe2WO6 by Electromotive Force Measurement.

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  • Koyama Koichiro
    Department of Materials Science and Engineering, Faculty of Engineering, Himeji Institute of Technology
  • Harada Tomohiro
    Graduate School, Himeji Institute of Technology

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  • 起電力法によるＦｅＷＯ４およびＦｅ２ＷＯ６の標準生成ギブスエネルギーの測定
  • キデンリョクホウ ニ ヨル FeWO4 オヨビ Fe2WO6 ノ ヒョウジュン

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The standard Gibbs free energies for the formation of FeWO4 and Fe2WO6 were determined in the temperature range from 1123K to 1273K by measuring electromotive forces of galvanic cells having a solid oxide electrolyte. The results obtained are as follows:<BR>(1) ΔtG ?? (FeWO4)=-1184300+357. 6T±200 J/mol<BR>ΔtG ?? (FeWO4)=-1184300+357.4T±200 J/mol<BR>(2) ΔtG ?? (Fe2WO6) =- 1651900+516. 1 T ±300 J/mol<BR>ΔtG ?? (Fe2WO6)=-1651900+515.8T±300 J/mol, <BR>where the superscript ?? denotes that the standard pressure is 1 bar(100, 000 Pa) whereas ?? denotes 1 atm(101, 325 Pa).

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