Abstract
The local electronic structure of tellurium atoms in As 2Te 3–GeTe crystalline compounds is experimentally studied by the combined use of X-ray photoelectron spectroscopy (XPS), X-ray absorption spectroscopy (XAS) and 125Te Mössbauer spectroscopy. From As 2Te 3 to GeTe it is found that: (i) the Te 3d 5/2 core-level binding energy measured by XPS decreases; (ii) the energy of the main XAS peak observed at the Te L I edge increases and the XAS peak broadens; and (iii) the 125Te Mössbauer quadrupole splitting decreases. These observed variations are explained from the influence of the two very different Te local environments found in the As 2Te 3–GeTe compounds.
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