Thermophysical study of structural phase transitions in Na0.95Li0.05NbO3 solid solution
URI (for links/citations):https://link.springer.com/article/10.3103/S1062873816090148
Gorev, M. V.
Bondarev, V. S.
Raevskaya, S. I.
Flerov, I. N.
Malitskaya, M. A.
Raevskii, I. P.
Институт инженерной физики и радиоэлектроники
Базовая кафедра физики твердого тела и нанотехнологий
Journal Name:Bulletin of the Russian Academy of Sciences
Journal Quartile in Scopus:Q3
Bibliographic Citation:Gorev, M. V. Thermophysical study of structural phase transitions in Na0.95Li0.05NbO3 solid solution [Текст] / M. V. Gorev, V. S. Bondarev, S. I. Raevskaya, I. N. Flerov, M. A. Malitskaya, I. P. Raevskii // Bulletin of the Russian Academy of Sciences: Physics. — 2016. — Т. 80 (№ 9). — С. 1046-1050
Temperature dependences of specific heat Cp(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 Cp(T) and α(T) anomalies at T3 = 310 ± 3 K, T2 = 630 ± 8 K, and T1 = 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 Cp(T) and ;(T) dependence. Possible mechanisms of the observed phenomena are discussed.