Abstract
Temperature dependences of specific heat C p(T) and coefficient of thermal expansion ;(T) for Na0.95Li0.05NbO3 sodium-lithium niobate ceramic samples are investigated in the temperature range of 100–800 K. The C p(T) and α(T) anomalies at T 3 = 310 ± 3 K, T 2 = 630 ± 8 K, and T 1 = 710 ± 10 K are observed, which correspond to the sequence of phase transitions N ↔ Q ↔ S(R) ↔ T2(S). The effect of heat treatment of the samples on the sequence of structural distortions was established. It is demonstrated that annealing of the samples at 603 K leads to splitting of the anomaly corresponding to the phase transition Q → R/S in two anomalies. After sample heating to 800 K, the only anomaly is observed in both the C p(T) and ;(T) dependence. Possible mechanisms of the observed phenomena are discussed.
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Original Russian Text © M.V. Gorev, V.S. Bondarev, S.I. Raevskaya, I.N. Flerov, M.A. Malitskaya, I.P. Raevskii, 2016, published in Izvestiya Rossiiskoi Akademii Nauk, Seriya Fizicheskaya, 2016, Vol. 80, No. 9, pp. 1145–1149.
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Gorev, M.V., Bondarev, V.S., Raevskaya, S.I. et al. Thermophysical study of structural phase transitions in Na0.95Li0.05NbO3 solid solution. Bull. Russ. Acad. Sci. Phys. 80, 1046–1050 (2016). https://doi.org/10.3103/S1062873816090148
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DOI: https://doi.org/10.3103/S1062873816090148