Open AccessФазовая диаграмма и особенности поведения мягких мод в твердых растворах со структурой хантита TbFe-=SUB=-3-x-=/SUB=-Ga-=SUB=-x-=/SUB=-(BO_3)-=SUB=-4-=/SUB=-
Author(s) -
А. С. Крылов,
А.Н. Втюрин,
И. А. Гудим,
И. В. Немцев,
S. N. Krylova
Publication year - 2022
Publication title -
optika i spektroskopiâ
Language(s) - English
Resource type - Journals
eISSN - 2782-6694
pISSN - 0030-4034
DOI - 10.21883/os.2022.01.51893.38-21
Subject(s) - raman spectroscopy , phase diagram , phase (matter) , materials science , phase transition , soft modes , solid solution , crystallography , spectral line , atmospheric temperature range , x ray crystallography , thermodynamics , chemistry , diffraction , physics , metallurgy , optics , optoelectronics , organic chemistry , astronomy , ferroelectricity , dielectric
The Raman spectra of four crystals of TbFe3-хGax (BO3) 4 solid solutions (x from 0 to 0.54) were studied in the temperature range from 8 to 350 K. The temperatures of structural phase transitions were determined. The observed spectral behavior is characteristic to condensation and restoration of soft modes. Soft modes are associated with a structural phase transition from the R32 phase to the P3121 phase. The Compositions-Temperature phase diagram was constructed