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

doi:10.1063/1.4739766

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

SCI - Earth Science

Research output: Contribution to journal › Article › peer-review

17 Citations (Scopus)

Abstract

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 language	English
Article number	043501
Journal	Journal of Applied Physics
Volume	112
Issue number	4
DOIs	https://doi.org/10.1063/1.4739766
Publication status	Published - 2012 Aug 15

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

abstract = "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.",

author = "Li Lei and Hiroaki Ohfuji and Tetsuo Irifune and Jiaqian Qin and Xinyu Zhang and Toru Shinmei",

note = "Funding Information: This work was supported by the Ehime University Global Center of Excellence (COE) program. X. Zhang acknowledges funding from the National Natural Science Foundation of China under Grant No. 51002130.",

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doi = "10.1063/1.4739766",

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T1 - Disorder-activated Raman spectra of cubic rocksalt-type Li (1-x)/2Ga (1-x)/2M xO (M Mg, Zn) alloys

AU - Lei, Li

AU - Ohfuji, Hiroaki

AU - Irifune, Tetsuo

AU - Qin, Jiaqian

AU - Zhang, Xinyu

AU - Shinmei, Toru

N1 - Funding Information: This work was supported by the Ehime University Global Center of Excellence (COE) program. X. Zhang acknowledges funding from the National Natural Science Foundation of China under Grant No. 51002130.

PY - 2012/8/15

Y1 - 2012/8/15

N2 - 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.

AB - 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.

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

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