Neutron Diffraction Study of Liquid Te-I Mixtures

Abstract

The atomic structure of liquid Te_1-xI_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_0.1I_0.9.