Abstract
The measurements of the resonance shifts of 77 Se and 125 Te, Δ H ( 77 Se) and Δ H ( 125 Te), have been done for liquid Se–Te mixtures up to 600°C and 500 bar. A rapid increase in Δ H ( 77 Se) at higher temperatures has been observed for the Se-rich mixtures, which is ascribed to the increase in the number of onefold defect states C 1 0 . In Te-rich concentration range there appears the contribution of conduction electrons to Δ H ( 125 Te), where the structure of the liquid mixtures changes from Se-like to Te-like structure. Near the structural transition region, the pressure derivative of Δ H ( 125 Te) versus temperature curve shows maximum as a consequence of the collapse of chain structure. It is suggested that Te sites in the chain rather than Se sites tend to be transformed to threefold coordinated C 3 0 states by increasing Te concentration or by applying pressure.
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