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Synthesis, structural and optical‐vibration properties of Ba 3 Sc 4 O 9 and Sr 3 Sc 4 O 9 ceramics
Author(s) -
Dias Anderson,
Moreira Roberto Luiz
Publication year - 2019
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.5536
Subject(s) - raman spectroscopy , ionic radius , phonon , polar , raman scattering , materials science , lattice vibration , molecular vibration , ceramic , luminescence , ion , degenerate energy levels , analytical chemistry (journal) , crystallography , mineralogy , chemistry , physics , condensed matter physics , optics , optoelectronics , organic chemistry , chromatography , quantum mechanics , astronomy , composite material
Ba 3 Sc 4 O 9 and Sr 3 Sc 4 O 9 ceramics were synthesized by conventional solid‐state reactions at 1200°C, being further sintered at 1300°C in order to produce ceramic bodies suitable for exploring their structural and optical vibration properties. Optimized experimental conditions were employed to unveil the complex vibrational spectra of these ceramics by polarized Raman scattering. A reliable and comprehensive set of phonon features was obtained from these experiments: The 30 theoretically expected optically active lattice modes for each material were in fact observed, from which 15 could be assigned as totally symmetric A‐polar modes and 15 attributed as degenerate (and asymmetric) E‐polar ones. Differences between experimental data of Ba‐containing and Sr‐containing samples are discussed in terms of their ionic radii and molar masses. The knowledge of the optical phonon features reported here can help to understand the exceptional luminescence properties of Ba 3 Sc 4 O 9 and Sr 3 Sc 4 O 9 rhombohedral phases when doped with trivalent ions, as recently reported by the literature.