Journal article

Authors list: Timm, H; Janek, J

Publication year: 2005

Pages: 1131-1143

Journal: Solid State Ionics

Volume number: 176

Issue number: 11-12

ISSN: 0167-2738

DOI Link: https://doi.org/10.1016/j.ssi.2005.01.010

Publisher: Elsevier

Abstract: 
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 a(O2)=-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.

Harvard Citation style: Timm, H. and Janek, J. (2005) On the Soret effect in binary nonstoichiometric oxides - kinetic demixing of cuprite in a temperature gradient, Solid State Ionics, 176(11-12), pp. 1131-1143. https://doi.org/10.1016/j.ssi.2005.01.010

APA Citation style: Timm, H., & Janek, J. (2005). On the Soret effect in binary nonstoichiometric oxides - kinetic demixing of cuprite in a temperature gradient. Solid State Ionics. 176(11-12), 1131-1143. https://doi.org/10.1016/j.ssi.2005.01.010