کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9804004 | 1516476 | 2005 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Determination of the standard free energies of formation for tungsten silicides by EMF measurements using lithium silicate liquid electrolyte
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Determination of the standard free energies of formation for tungsten silicides by EMF measurements using lithium silicate liquid electrolyte Determination of the standard free energies of formation for tungsten silicides by EMF measurements using lithium silicate liquid electrolyte](/preview/png/9804004.png)
چکیده انگلیسی
EMF measurements on silicon concentration cell were carried out using lithium silicate electrolyte in the temperature range 1300-1500 K. Using the EMF-temperature relations obtained, the standard free energies of formation for W5Si3 and WSi2 have been calculated as functions of temperature: ÎG0(W5Si3) (kJ molâ1) = â128.6 â 0.0132 (T (K)) ± 0.42 and ÎG0(WSi2) (kJ molâ1) = â98.5 + 0.0095 (T (K)) ± 0.15, respectively. Combining the results with thermodynamic data, the standard enthalpies of formation for silicides at 298 K have been obtained as ÎH0(W5Si3, 298) (kJ molâ1) = â133 ± 25 and ÎH0(WSi2, 298) (kJ molâ1) = â82 ± 6, respectively. A new eutectoid reaction W5Si3 â W + WSi2 occurring around 700 K is suggested in W-Si binary system.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 391, Issues 1â2, 5 April 2005, Pages 307-312
Journal: Journal of Alloys and Compounds - Volume 391, Issues 1â2, 5 April 2005, Pages 307-312
نویسندگان
Hiroyasu Fujiwara, Yukitomi Ueda, Alok Awasthi, Nagaiyar Krishnamurthy, Sheo Parkash Garg,