Timm, H.H.TimmJanek, JürgenJürgenJanek2023-06-122005-09-142023-06-122005http://nbn-resolving.de/urn:nbn:de:hebis:26-opus-23843https://jlupub.ub.uni-giessen.de/handle/jlupub/16728http://dx.doi.org/10.22029/jlupub-16106The Soret effect in nonstoichiometric copper(I)-oxide (cuprite, Cu2-deltaO) 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 is equivalent to 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.enIn Copyrightddc:540