Nature of the local environment of germany atoms in amorphous films (GeTe)-=SUB=-x-=/SUB=-(Sb-=SUB=-2-=/SUB=-Te-=SUB=-3-=/SUB=-)

Abstract

Using Messbauer spectroscopy on 119Sn impurity atoms, it was demonstrated that in amorphous (GeTe)x(Sb2Te3) 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 4b of the NaCl-type crystal lattice. Keywords: amorphous films, phase memory, Messbauer spectroscopy.