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Polarization‐resolved Raman modes of monoclinic SrAl 2 O 4 ceramics
Author(s) -
Dias Anderson,
Moreira Roberto Luiz
Publication year - 2018
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.5405
Subject(s) - monoclinic crystal system , raman spectroscopy , ceramic , materials science , polarization (electrochemistry) , luminescence , phonon , raman scattering , spectroscopy , molecular vibration , analytical chemistry (journal) , mineralogy , crystallography , optics , crystal structure , chemistry , optoelectronics , condensed matter physics , organic chemistry , physics , composite material , quantum mechanics
SrAl 2 O 4 materials were obtained by molten salt synthesis and sintered at high temperatures to produce a ceramic body suitable for polarization‐resolved Raman spectroscopy measurements. Optimized experimental conditions were employed to study the complex vibrational spectrum of these ceramics under polarized light. A reliable set of experimental bands was obtained: 69 Raman modes were in fact observed, out of the 81 bands foreseen for the stable monoclinic polymorph of the material, from which 38 could be assigned as totally symmetric A‐type modes, and 31 attributed as asymmetric B‐type ones. Significant differences between experimental data and theoretical predictions indicated that additional efforts are necessary to understand these two sets of vibrational information. The knowledge of the optical phonon features reported here can help to understand the exceptional luminescence properties of SrAl 2 O 4 in its monoclinic phase.