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
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
پیش نمایش صفحه اول مقاله
On the Soret effect in binary nonstoichiometric oxides-kinetic demixing of cuprite in a temperature gradient
چکیده انگلیسی
The Soret effect in nonstoichiometric copper(I)-oxide (cuprite, Cu2−δ 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*Cu≈180 kJ/mol at a temperature of 1000 °C and at an oxygen activity of log aO2=−2.95. 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 11–12, 31 March 2005, Pages 1131-1143
نویسندگان
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