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High temperature Raman scattering in Sm 0.8 La 0.2 AlO 3 Compound: A relation to the phase transition in rare earth orthoaluminates
Author(s) -
Alain P.,
Coutures J. P.,
Piriou B.
Publication year - 1979
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.1250080205
Subject(s) - raman spectroscopy , raman scattering , rare earth , phase transition , phonon , analytical chemistry (journal) , phase (matter) , materials science , mineralogy , aluminate , chemistry , crystallography , condensed matter physics , optics , physics , organic chemistry , chromatography , cement , metallurgy
Raman spectra of molten Sm 0.8 La 0.2 AlO 3 have been recorded from room temperature to 1470 K. Experimental results show that a first‐order phase transition occurs at 580 K and that two phonon modes appear very unstable in the high temperature phase. Comparison with Raman data obtained on rare earth aluminate single crystals indicates that these ‘soft’ modes may be associated with a rhombohedral to cubic phase transition.