Abstract
Experimental data demonstrate that Li x Na1 − y Ta y Nb1 − y O3 (y ≠ 0) ferroelectric solid solutions near special concentration points (x = 0.125 and 0.25), which have increased degrees of short- and long-range order, undergo a superionic transition. In the Raman spectra of Li0.12Na0.88Ta y Nb1 − y O3, the superionic transition shows up as a predominant “melting” of the alkali metal sublattice and broadening of the corresponding lines into a Rayleigh line wing, whereas the other sublattices in the structure remain relatively “rigid.” The temperature of the superionic transition can be tuned by varying the degree of static disorder of structural units in the Nb5+/Ta5+ sublattice.
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Original Russian Text © N.V. Sidorov, M.N. Palatnikov, N.A. Teplyakova, E.Yu. Obryadina, V.V. Efremov, 2013, published in Neorganicheskie Materialy, 2013, Vol. 49, No. 6, pp. 635–641
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Sidorov, N.V., Palatnikov, M.N., Teplyakova, N.A. et al. Ionic conductivity of Li x Na1 − x Ta y Nb1 − y O3 solid solutions. Inorg Mater 49, 595–601 (2013). https://doi.org/10.1134/S0020168513050154
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DOI: https://doi.org/10.1134/S0020168513050154