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Structural transformations in a single‐crystal Rb 2 NaYF 6 : Raman scattering study
Author(s) -
Krylov A. S.,
Vtyurin A. N.,
Oreshonkov A. S.,
Voronov V. N.,
Krylova S. N.
Publication year - 2013
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.4263
Subject(s) - raman spectroscopy , phase transition , hydrostatic pressure , raman scattering , chemistry , spectral line , atmospheric temperature range , lattice (music) , crystal (programming language) , crystal structure , single crystal , analytical chemistry (journal) , molecular vibration , crystallography , condensed matter physics , thermodynamics , optics , physics , chromatography , astronomy , computer science , acoustics , programming language
This paper reports Raman spectroscopy investigation of phase transitions in Rb 2 NaYF 6 crystal. The experimental spectra were compared with the calculated one. The spectra were obtained in temperature range from 8 to 300 K. The Raman spectra shows anomalous temperature‐dependent behavior at T 1 = 154 and T 2 = 122 K. Soft mode restoration has been found, which allows us to attribute first transition at 154 K to displacive type. Detailed analysis temperature dependencies of the line positions and widths have been performed. We found no effects of possible lattice disorder anywhere, except narrow (about 20 K) range above the T 1 temperature. The Raman spectra of Rb 2 NaYF 6 crystal have been obtained and analyzed under hydrostatic pressure up to 4.33 GPa (at T = 295 K). The high pressure experiment up to 4.33 GPa did not disclose any effects associated with phase transitions. The lattice vibration spectra were calculated up to 10 GPa. The calculation has been demonstrated that the Rb 2 NaYF 6 does not undergo high pressure phase transition. Copyright © 2013 John Wiley & Sons, Ltd.