Isofrequency temperature dependences of Rayleigh and hyper-Rayleigh scattering intensities have been measured in isotopically substituted <$Eroman {Li sub 2 B sub 4 O sub 7 }> crystals within a wide temperature range (300 - 1 000 K). The dependences contain two anomalies in the vicinities of 520 and 800 K. The first anomaly is associated with hopping of lithium ions between two non-equivalent positions, with the activation energy of about 0,23 eV. The second one results from the first-order order-disorder phase transition due to themelting of lithium sublattice. The temperature dependence of the relaxation time obtained by analysing quasi-elastic light scattering spectra is satisfactorily described, using the theoretical relation typical for such the phase transitions, with the relevant parameters <$ET sub c ~=~790~ roman K> and <$EDELTA ~=~0,95>.

• Бурак Ярослав Володимирович (1943–) (фізико-математичні науки)

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