Abstract
Derivatographic, dielectric and complex impedance studies of Rb4LiH3(SeO4)4 crystals revealed a superionic phase transition at T$ = 448 K. The bulk conductivity rises from 10 -6 to 10 -4 (Ωm)-1 at Ts , and the activation energy of conductivity in the direction of crystal axes a and b (where a = b for tetragonal symmetry) Wa = Wb decreases from 0.94 eV in the low temperature phase to the value of 0.27 eV at T > T5. The analysis of the results of X-ray studies at room temperature and at 450 K indicates that the fast ion transport, characterized by low activation energy, is related to the delocalization of the H2 protons in the O(12)—H2-O(24) bonds linking the Se(1)O 4 and Se(2)O4 tetrahedra. The cogwheel mechanism is suggested to be involved in the fast proton transport. PACS numbers: 61.50.Em, 62.20.Dc, 77.22.Gm
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