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Raman Spectroscopic Study of the Optical Phonons of Mg 2 Si 1− x Sn x Solid Solutions
Author(s) -
Yasseri Mohammad,
Schüpfer Dominique,
Chen Limei,
Kamila Hasbuna,
Müller Eckhard,
de Boor Johannes,
Klar Peter J.
Publication year - 2020
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.201900574
Subject(s) - raman spectroscopy , phonon , raman scattering , solid solution , diffraction , materials science , degenerate energy levels , analytical chemistry (journal) , context (archaeology) , coherent anti stokes raman spectroscopy , x ray raman scattering , condensed matter physics , chemistry , physics , optics , paleontology , chromatography , quantum mechanics , metallurgy , biology
Mg 2 Si 1− x Sn x solid solutions are prepared in the composition range from x = 0 to 1 by mechanical alloying using high‐energy ball milling followed by direct‐current sintering at 600–800 °C. X‐ray diffraction analysis confirms that the samples obtained are uniform solid solutions. Raman spectroscopy shows two first‐order phonon Raman bands and a distribution of Raman signals due to second‐order phonon Raman scattering. The first‐order Raman bands are assigned to the nondegenerate Raman‐forbidden F 1u (LO) mode and the triply degenerate Raman‐allowed F 2g mode. Both modes exhibit a linear shift of the phonon frequency with a composition showing a clear one‐mode behavior for this solid solution. The findings are discussed in the context of existing theories for the occurrence of the one‐mode or two‐mode behavior of phonons in solid solutions.