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Neutron Diffraction Study of Liquid Te-I Mixtures

The atomic structure of liquid Te 1- x I x mixtures with x =0.2, 0.4, 0.5, 0.6, 0.7, 0.8 and 0.9 has been measured in the temperature range from 525 to 873 K. Distinct changes in the structure factors have been observed in the concentration ranges from x =0.2 to 0.4 and from 0.8 to 0.9. The structural changes in Te-I mixtures mainly reflect the variation in the number-number correlation function. The metal-nonmetal transition in this system is closely related to the change in topology of the melt. The iodine-iodine correlation mainly contributes to the first peak region in the radial distribution function of liquid Te 0.1 I 0.9 .