Abstract
Chemical short range order and topology of Ge$_{x}$Ga$_{x}$Te$_{100-2x}$ glasses was investigated by neutron- and x-ray diffraction as well as Ge and Ga K-edge extended x-ray absorption fine structure (EXAFS) measurements. Large scale structural models were obtained by fitting experimental datasets simultaneously with the reverse Monte Carlo simulation technique. Models, relying only on experimental data and basic physical information without constraining the average coordination numbers, give 3.9 - 4.1 for the number of the atoms in the first coordination sphere of Ge atoms, while the average number of first neighbors of Ga atoms scatters around 3.8. The average coordination number of Te atoms is significantly higher than 2 for $x$ = 12.5 and 14.3. It is found that the vast majority of MTe$_4$ (M=Ge or Ga) tetrahedra have at least one corner sharing MTe$_4$ neighbor.
Highlights
Due to their broad infrared transmission window glassy tellurides are extensively used in various fields of IR optics
We studied the structure of GexGaxTe100-2x glasses by combining X-ray and neutron diffraction data with Ge- and Ga K-edge extended x-ray absorption fine structure (EXAFS) measurements in the framework of the reverse Monte Carlo simulation technique
Partial pair correlation functions (gij(r)) obtained for the unconstrained model are shown in Fig. 5 while bond lengths and average coordination numbers are collected in Tables 3 and 4
Summary
Due to their broad infrared transmission window glassy tellurides are extensively used in various fields of IR optics. 1. The structure of GexGaxTe100-x (x = 7.5, 10, 12.5, 14.3) glasses has been investigated by combining neutron- and X-ray diffraction, and EXAFS measurements in the same structural model.
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