The Raman spectroscopic characterization of the orthorhombic phase of Cs2RuO4 was carried out by means of group theory and quantum chemical analysis. Multiple models based on ruthenate (VI+) tetrahedra were tested, and characterization of all the active Raman modes was achieved. A comparison of Raman spectra of Cs2RuO4, Cs2MoO4, and Cs2WO4 was also performed. Raman laser heating induced a phase transition from an ordered to a disordered structure. The temperature-phase transition was calculated from the anti-Stokes/Stokes ratio and compared with the ones measured at macroscopic scale. The phase transition is connected with tilting and/or rotations of RuO4 tetrahedra, which lead to a disorder at the RuO4 sites.
NAJI Mohamed;
DI LEMMA Fidelma;
KOVACS Attila;
BENES Ondrej;
MANARA Dario;
COLLE Jean-Yves;
PAGLIOSA Giorgio;
RAISON Philippe;
KONINGS Rudy;
2015-10-06
WILEY-BLACKWELL
JRC92285
0377-0486,
http://onlinelibrary.wiley.com/doi/10.1002/jrs.4705/abstract,
https://publications.jrc.ec.europa.eu/repository/handle/JRC92285,
10.1002/jrs.4705,
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