Abstract
The thermal motion of Cu+ ions in a quasi-two dimensional copper ion conductor CuCrSe2 is studied in the vicinity of the order-disorder phase transition to superionic phase, basing on a single-crystal and powder X-ray diffraction, specific heat and electrical resistivity measurements. The copper ions gradually migrate with temperature decrease to empty tetrahedral sites reaching occupancy equilibrium in the disordered high-temperature phase at Ts = 365 K. The copper migration between Cuα and Cuβ tetrahedral sites occurs through the neighboring, face-sharing octahedral holes. Disorder of Cu+ ions brings perturbations in periodic potential of the crystal lattice providing additional scattering centers for electrons.
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