Disorder-activated Raman spectra of cubic rocksalt-type Li (1-x)/2Ga (1-x)/2M xO (M Mg, Zn) alloys

Li Lei, Hiroaki Ohfuji, Tetsuo Irifune, Jiaqian Qin, Xinyu Zhang, Toru Shinmei

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17 Citations (Scopus)


Disorder-activated phonon behaviors of the cubic rocksalt-type semiconductor alloy Li (1-x)/2Ga (1-x)/2M xO (M Mg, Zn) prepared by high-pressure and high-temperature method has been studied by Raman scattering analysis. The LO Raman phonon in Li (1-x)/2Ga (1-x)/2M xO was found to exhibit a distinct two-mode behavior. The compositional dependence of Raman frequency, peak-width, and intensity has been discussed. A model associated with a composite mode of the Brillouin zone center and edge phonons combined with phonon dispersion curves determined by first-principle calculations were employed to explain the asymmetric broadening of the LO phonon mode. The broadening and asymmetric Raman line-shape in Li (1-x)/2Ga (1-x)/2M xO can be interpreted as a composite mode of the softening Brillouin zone center mode and the Brillouin zone edge mode.

Original languageEnglish
Article number043501
JournalJournal of Applied Physics
Issue number4
Publication statusPublished - 2012 Aug 15


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