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Temperature‐Dependent Raman Study of Nanostructured and Multifunctional Materials
Author(s) -
Šćepanović Maja,
GrujićBrojčin Mirjana,
Lazarević Nenad,
Popović Zoran V.
Publication year - 2019
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201800763
Subject(s) - raman spectroscopy , brookite , nanocrystalline material , materials science , anharmonicity , anatase , phonon , phase (matter) , phase transition , analytical chemistry (journal) , nanotechnology , chemistry , condensed matter physics , optics , physics , biochemistry , organic chemistry , photocatalysis , chromatography , catalysis
The scope of this paper is temperature dependence of Raman spectra in several nanocrystalline materials and iron‐based single‐crystals. The Raman results presented and analyzed here are related to TiO 2 nanopowders (with dominant anatase and brookite phase) and Zn x Cd 1−x Se single layers measured at different temperatures. Temperature‐dependent Raman spectra of iron‐based sulphides and selenides (BaFe 2 S 3 and BaFe 2 Se 3 ), as well as alkali‐doped iron selenides (K x Fe 2− y Se 2 and K 0.8 Fe 1.8 Co 0.2 Se 2 ) are also analyzed. A physical model, including thermal expansion as well as three‐ and four‐phonon anharmonic effects, is used to quantitatively analyze temperature evolution of the characteristic Raman mode self‐energies for the materials of interest. It is demonstrated how this model can be used as a tool for predicting the temperature of structural and phase transitions, with critical scrutany of its limitations.