Abstract
The influence of amorphization on the symmetry of the local environment of chalcogen atoms in the As2S3, As2Se3, and As2Te3 compounds is investigated using Mossbauer emission spectroscopy. In the 129Te(129I) Mossbauer emission spectra of crystalline As2Te3, three states of threefold-coordinated tellurium atoms appear to be indistinguishable. The transformation of the As2Te3 crystalline compound into the vitreous state results in the lowering of the local symmetry of threefold-coordinated states of the tellurium atoms and the formation of twofold-coordinated states of the tellurium atoms in chains of the type-As-Te-Te-As-. Two states of twofold-coordinated chalcogen (X) atoms in chains of the type-As-X-As-in the structure of the As2S3 and As2Se3 crystalline compounds manifest themselves in the form of a broadening of the Mossbauer spectra. The transformation of the As2S3 and As2Se3 crystalline compounds into the vitreous state is not accompanied by a change in the local symmetry of twofold-coordinated chalcogen atoms in chains of the type-As-X-As-; however, the structure of the glass in this case is characterized by the formation of twofold-coordinated states of sulfur and selenium atoms in chains of the type-As-X-X-As-. The fraction of twofold-coordinated chalcogen atoms increases upon changing over from As2 X 3to AsX.
Published Version
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