Solids

Local structure of amorphous (GeTe)$_x$(Sb$_2$Te$_3$) films

A. V. Marchenko^a, E. I. Terukov^bc, F. S. Nasredinov^d, Yu. A. Petrushin^a, P. P. Seregin<sup>a

a</sup> Herzen State Pedagogical University of Russia, St. Petersburg, Russia
^b Ioffe Institute, St. Petersburg, Russia
^c Saint Petersburg Electrotechnical University "LETI", St. Petersburg, Russia
^d Peter the Great St. Petersburg Polytechnic University, St. Petersburg, Russia

Abstract: By the method of Messbauer spectroscopy on the isotope $^{119}$Sn, it was shown that tetravalent germanium atoms in amorphous films (GeTe)$_x$(Sb$_2$Te$_3$) (where $x$ = 0.5, 1, 2, 3) form a tetrahedral system of chemical bonds, and in their local environment there are mainly tellurium atoms. In crystalline films (GeTe)$_x$(Sb$_2$Te$_3$) is divalent hexoordinated germanium at positions 4$b$ of the NaCl type crystal lattice. By the method of Messbauer spectroscopy on $^{121}$Sb and $^{125}$Te atoms, it was shown that the amorphization of (GeTe)$_x$(Sb$_2$Te$_3$) films does not change the local environment of antimony and tellurium atoms.

Keywords: amorphous films, phase memory, Messbauer spectroscopy.

Received: 20.07.2022
Revised: 20.07.2022
Accepted: 08.08.2022

DOI: 10.21883/JTF.2022.11.53441.186-22

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