Nature of the Local Environment of Atoms in Ge3Sb2Te6, Ge2Sb2Te5, GeSb2Te4, and GeSb4Te7 Amorphous and Crystalline Films

The valence state and local environment of atoms in Ge 3 Sb 2 Te 6 , Ge 2 Sb 2 Te 5 , GeSb 2 Te 4 , and GeSb 4 Te 7 amorphous and crystalline films are determined by Mössbauer spectroscopy (MS) on isotopes 119 Sn, 121 Sb, and 125 Te. In crystalline films, divalent germanium is located in octahedral...

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Bibliographic Details
Published in:Glass physics and chemistry 2023-02, Vol.49 (1), p.50-56
Main Authors: Bordovsky, G. A., Marchenko, A. V., Nasredinov, F. S., Petrushin, Yu. A., Seregin, P. P.
Format: Article
Language:English
Subjects:
Antimony
Ceramics
Characterization and Evaluation of Materials
Chemical bonds
Chemistry and Materials Science
Composites
Germanium
Glass
Materials Science
Mossbauer spectroscopy
Natural Materials
Physical Chemistry
Tellurium
Valence
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Summary:The valence state and local environment of atoms in Ge 3 Sb 2 Te 6 , Ge 2 Sb 2 Te 5 , GeSb 2 Te 4 , and GeSb 4 Te 7 amorphous and crystalline films are determined by Mössbauer spectroscopy (MS) on isotopes 119 Sn, 121 Sb, and 125 Te. In crystalline films, divalent germanium is located in octahedral positions in a rhombohedrally distorted NaCl-type of lattice, whereas in amorphous films, tetravalent germanium atoms form a tetrahedral system of chemical bonds. In all films, the nearest environment of germanium contains predominantly tellurium atoms. Trivalent antimony atoms in crystalline and amorphous films occupy two types of octahedral positions differing in the degree of distortion, and in the nearest environment of antimony there are tellurium atoms. Finally, in all films, the local structures of tellurium atoms correspond to tellurium structural units in the GeTe and Sb 2 Te 3 compounds.
ISSN:1087-6596
1608-313X
DOI:10.1134/S1087659622600867