A study of the short-range ordering in Ge xSb yTe (100− x− y) glasses by X-ray absorption spectroscopy

Abstract

The short-range order around Ge atoms in Ge x Sb y Te (100− x− y) ( x = 15, y = 0.5, 3 and 5) glasses has been investigated by using X-ray absorption spectroscopy. Our structural results unambiguously show that Ge atoms in Ge x Sb y Te (100− x− y) are fourfold coordinated by uniquely Te atoms at the distance 2.60 Å and that no Ge-Ge homopolar bonds and no Ge-Sb bonds exist in these glasses.