Properties of Ga2-X-Te3 investigated by129I Mössbauer spectroscopy

¹²⁹I Mössbauer spectroscopy was used to study the properties of^129mTe labeled Ga₂Te₃. and alloyed (Ga₂Te₃)_xAu_y and (Ga₂Te₃)_xAs_y, sources. A satisfactory fit to the Ga₂Te₃ spectrum could only be obtained by introducing a distribution in the hyperfine interaction parameters. This is interpreted in favor of the hypothesis of a random distribution of the structural vacancies in the deficit cubic Ga₂Te₃. The addition of atomic percents of As to the compound did not change significantly the pure Ga₂Te₃ spectrum. The spectrum of Ga₂Te₃ alloyed with atomic percents of Au, on the contrary, could be fitted with only one component with a satisfactory narrow linewidth, suggesting that due to Au doping ordering is induced in the stoichiometric vacancies of the Ga₂Te₃ lattice structure.