Abstract
The room and high temperature structures of Li 2UI 6 have been determined using the neutron powder diffraction. It has been shown that at 300 K, the compound crystallizes in trigonal unit cell with a = b = 7.3927(8), c = 13.826(2) A ̊ with space group P-31c. Above the phase transition occuring at 775 K, the structure transforms into monoclinic C 2 m space group with unit cell constants: a = 7.733(5), b = 13.234(7), c = 7.645(4) A ̊ , β = 110.59(3) deg . The measurement of electrical conductivity as a function of temperature has been performed. Based on the crystallographic data, a discussion of the shape of observed conductivity curve has been carried out.
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