Structures of Molten CuCl, CuBr and CuI

The structures of molten CuCl, CuBr and CuI have been measured at two temperatures, using the neutron diffraction. The structure factors of molten CuI and CuBr show a distinct prepeak at about 0.9 Å -1 . These peaks may be caused by a kind of chemical ordering effect. The information of partial structures are estimated from the total pair distribution functions and the total radial distribution functions using the Davidon-Fletcher-Powell method. In molten CuCl, the first peak positions of the partial distribution functions agreed with those obtained by the isotope enrichment method.