Abstract
Raman spectroscopic, X-ray diffraction and extended X-ray absorption fine structure measurements have been carried out on the amorphous (As 0.5Te 0.5) 1− x I x system with 0⩽ x⩽0.3. AsI 3 molecular units and mixed-anion structural units are not formed in the system. The I atoms incorporated into amorphous As 0.5Te 0.5 are preferentially bonded to Te atoms and terminate the As–Te network structure. The bond distances for all atomic pairs contained in the first coordination shell remain almost constant for all compositions studied, being r As–As=0.252 ± 0.001, r As–Te=0.265 ± 0.002 and r Te–I=0.274 ± 0.002 nm. These numbers agree well with those determined by curve fitting the EXAFS oscillation functions. The total coordination numbers of As, Te and I atoms in the system are determined to be three, two and unity, respectively.
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