کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9761686 | 1498424 | 2005 | 13 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
On the Soret effect in binary nonstoichiometric oxides-kinetic demixing of cuprite in a temperature gradient
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The Soret effect in nonstoichiometric copper(I)-oxide (cuprite, Cu2âδ O) has been studied experimentally by means of non-isothermal solid state galvanic cells (thermocells) under different boundary conditions. At high temperatures and high oxygen activities, copper metal migrates down the temperature gradient and a gradient in the nonstoichiometry is established under stationary conditions. The heat of transport of copper metal is determined as Q*Cuâ180 kJ/mol at a temperature of 1000 °C and at an oxygen activity of log aO2=â2.95. This result agrees with recent theoretical simulations of the heat of transport of atoms migrating via a vacancy mechanism. These predict a positive sign of the heat of transport and a considerably larger value than the activation energy for the atomic jumps.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solid State Ionics - Volume 176, Issues 11â12, 31 March 2005, Pages 1131-1143
Journal: Solid State Ionics - Volume 176, Issues 11â12, 31 March 2005, Pages 1131-1143
نویسندگان
H. Timm, J. Janek,