期刊
SOLID STATE IONICS
卷 178, 期 5-6, 页码 447-456出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ssi.2007.01.026
关键词
thermoelectric materials; CU3Mo6Se8; beta-Zn4Sb3; tracer diffusion
The diffusion of radioactive tracers, Ag-110m diffusing in Cu3Mo6Se8 and Zn-65 diffusing in beta-Zn4Sb3, was experimentally studied. Tracer concentration profiles were generated by diffusion -annealing samples in argon atmosphere containing 1-2% H-2. The corresponding residual radioactivity profiles were measured and analyzed to determine tracer diffusion coefficients of Ag-110m diffusing in Cu3Mo6Se8 and of Zn-65 diffusing in beta-Zn4Sb3''. The temperatures investigated were between about 195 and 900 degrees C and between about 195 and 475 degrees C for beta-Zn4Sb3. It was found that the diffusion of Ag in Cu3Mo6Se8 and of Zn in beta-Zn4Sb3 is very fast, with tracer diffusion coefficients on the order of 10(-5) to 10(-6) cm(2)/s in the temperature ranges considered. The temperature dependencies of the tracer diffusion coefficients denoted above can be describedby using Arrhenius-type relations. The values determined for activation energies are 18.70 +/- 0.95 kJ/mol for the tracer diffusion of Zn-65 in beta-Zn4Sb3. These values are comparable to the very low activation energy of 9.16 kJ/mol observed for the diffusion of Ag in the fast ion conductor alpha-Agl. (c) 2007 Elsevier B.V. All rights reserved.
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