Manifestations of Structural Phase Transitions in a Rb2KLuF6 Crystal in Its Raman Spectra


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The Raman spectra of an Rb2KLuF6 crystal are studied in the temperature range from 8 to 375 K, which includes two phase transitions: one of which proceeds from a cubic to a tetragonal phase, while the other transition takes place from a tetragonal to a monoclinic phase. An analysis of the temperature dependences of parameters of spectral lines shows that the former transition is of the second kind, while the latter transition is of the first kind, close to the tricritical point. It is shown that the structural phase transitions in the Rb2KLuF6 double perovskite are not associated with disordering. The former transition is associated with rotations of LuF6 octahedra around the fourth-order axis, while the latter transition is related with rotations of octahedra and displacements of rubidium ions.

作者简介

A. Krylov

Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences

编辑信件的主要联系方式.
Email: slanky@iph.krasn.ru
俄罗斯联邦, Krasnoyarsk, 660036

A. Vtyurin

Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences; Siberian Federal University

Email: slanky@iph.krasn.ru
俄罗斯联邦, Krasnoyarsk, 660036; Krasnoyarsk, 660041

V. Voronov

Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences

Email: slanky@iph.krasn.ru
俄罗斯联邦, Krasnoyarsk, 660036

S. Krylova

Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences

Email: slanky@iph.krasn.ru
俄罗斯联邦, Krasnoyarsk, 660036

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