Defect Characterization in Thermoelectric Zn-Sb Systems by Positron Annihilation

Abstract:

Positron lifetimes and momentum distributions of annihilating electron-positron pairs have been calculated for vacancies in ZnSb and Zn₄Sb₃. The calculated positron lifetimes for bulk ZnSb and Zn₄Sb₃ are 203 ps and 208 ps, and for V_Zn in ZnSb and Zn₄Sb₃ are 249 ps and 237 ps respectively. The calculated momentum distribution results indicate the V_Zn in both ZnSb and Zn₄Sb₃ has less characterization from elemental Zn. Using coincidence Doppler broadening spectra combined with lifetime measurements can reveal the vacancy structure in ZnSb and Zn₄Sb₃.

• Periodical: Defect and Diffusion Forum (Volume 373)
• Pages: 245-248
• DOI: https://doi.org/10.4028/www.scientific.net/DDF.373.245
• Online since: March 2017
• Authors: Ting Zhang, Kai Zhou, Zhi Quan Chen*
• Keywords: Positron Annihilation, Vacancy, Zn₄Sb₃, ZnSb

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