Antistructural Defects in Ge–Te, As–Te, and Ge–As–Te Vitreous Alloys

Resumo

Emission Mössbauer spectroscopy on ^119mmSn(^119mSn), ¹¹⁹Sb(^119mSn), ^119mTe(^119mSn), ^125mTe(¹²⁵Te), ¹²⁵Sb(¹²⁵Te), ¹²⁵Sn(¹²⁵Te), and ^129mTe(¹²⁹I) isotopes is used as a method for the creation and identification of antistructural defects in Ge₂₀Te₈₀, As₃₀Te₇₀, and Ge₁₅As₄Te₈₁ vitreous alloys in forms of tin atoms in tellurium and arsenic positions, as well as tellurium atoms in germanium and arsenic positions. Tin atoms in the positions of arsenic and tellurium, and tellurium atoms in the positions of germanium and arsenic rearrange their local environment, while the symmetry of the local environment of germanium positions remains unchanged in the case of their isovalent replacement by tin atoms.