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The structure factors S(Q) of liquid tellurium measured by pulsed neutron diffraction at 490, 670 and 800 degrees C have been analysed using a method based on a short-chain model. The S(Q) and the pair distribution functions g(r) could be explained using this model. The mean chain length estimated for each temperature is rather short: about 14, 8, and 6 (Te atoms/chain) at 490, 670 and 800 degrees C, respectively. The enthalpy of scission of a Te-Te bond in the liquid state is estimated to be 14.5 kcal (g atom) -1 (0.63 eV). A rough estimation of the mean chain length of Se-Te liquid alloys as a function of the temperature and concentration suggests that an anomalous volume contraction may be related to a shortening of Se-Te mixed chains.
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M. Misawa (1992) studied this question.
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