Kinetics of phase transitions and amplitude dependences of Q−1 in Na0.875Li0.125NbO3

Autor:	M. A. Belousov, S.A. Gridnev, L.N. Korotkov, L. A. Reznichenko
Rok vydání:	2022
Předmět:	Phase transition Materials science Condensed matter physics Mechanical Engineering Metals and Alloys Atmospheric temperature range Ferroelectricity Shear modulus Amplitude Mechanics of Materials Phase (matter) Materials Chemistry Dislocation Solid solution
Zdroj:	Journal of Alloys and Compounds. 892:162009
ISSN:	0925-8388
DOI:	10.1016/j.jallcom.2021.162009
Popis:	The temperature and amplitude dependences of internal friction Q−1 and shear modulus G for the Na0.875Li0.125NbO3 solid solution were studied in the temperature range of 300–700 K. It was found that the material undergoes two structural phase transitions near temperatures T1 ≈ 620 K and T2 ≈ 559 K. Both low-temperature phases are ferroelectric one, whereas the phase above the temperature T1 is paraelectric one. It is shown that the main contribution to mechanical losses below T1 is related to the motion of domain walls. The Q−1 maxima observed near temperatures T1 and T2 are satisfactory described within the framework of the low-frequency fluctuation mechanism of internal friction. The amplitude dependences of Q−1 are in agreement with the Friedel dislocation model.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::cfea109a9ecc46c3966f6cb467528937 https://doi.org/10.1016/j.jallcom.2021.162009 Zobrazit plný text záznamu Full Text from ScienceDirect