Nature of the local environment of germany atoms in amorphous films (GeTe)$_x$(Sb$_2$Te$_3$)

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: Using Messbauer spectroscopy on $^{119}$Sn impurity atoms, it was demonstrated that in amorphous (GeTe)$_x$(Sb$_2$Te$_3$) films (where $x$ = 0.5, 1, 2, 3) tin atoms replace atoms of tetravalent germanium, which forms a tetrahedral system of chemical bonds with atoms in its local environment. In crystalline films, tin replaces divalent six-coordinated germanium in positions 4$b$ of the NaCl-type crystal lattice.

Keywords: amorphous films, phase memory, Messbauer spectroscopy.

Received: 28.04.2022
Revised: 12.06.2022
Accepted: 14.06.2022

DOI: 10.21883/PJTF.2022.15.53124.19239

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