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- W2045426977 abstract "Raman spectroscopy was used to study pulled ${mathrm{Li}}_{3}{mathrm{ThF}}_{7}$ single crystals between 298 and 403 K, using six special backscattering geometries. The observed Raman bands were very broad, owing to the disorder related to the statistical occupancy of the lithium sites (with a 3/4 probability). In spite of this, the symmetry rules are well respected assuming an average model with four lithium ions per chemical formula. The spectral evolutions show a structural phase transition occurring at 368 K. After peak deconvolution, we were able to determine and attribute most of the Raman modes corresponding to each phase. The results are compatible with the proposed orthorhombic (Ccca) to tetragonal $(P4/ncc)$ structural phase transition, whose ferroelastic nature would be responsible for the appearance of an ordered microcracking pattern in this crystal." @default.
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- W2045426977 date "1999-10-01" @default.
- W2045426977 modified "2023-10-02" @default.
- W2045426977 title "Raman scattering study of the orthorhombic-to-tetragonal phase transition of aLi3ThF7crystal" @default.
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- W2045426977 doi "https://doi.org/10.1103/physrevb.60.9983" @default.
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