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Kim, Young Il; Page, Katharine; Limarga, Andi M.; Clarke, David R.; Seshadri, Ram

doi:10.1103/physrevb.76.115204

Cited by 56 publications

(17 citation statements)

References 53 publications

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“…Here, 277 cm -1 mode appears as the MgO emerges in the Mg x Zn 1-x O samples, so this mode arises from MgO. As Mg content (x) increases, the 438 cm -1 mode does not shift, because this E 2(high) mode is associated with the vibration of oxygen atoms which was also confirmed by the isotopic mass dependence of the frequency shift measurements [25]. However, the 99.5, 204, 379, 410, 529 and 579 cm -1 modes blue-shift to 102, 213, 383, 415, 544 and 590 cm -1 , respectively, as Mg content (x) increases to 0.10.…”

Section: Resultssupporting

confidence: 72%

Structure and Raman scattering of Mg-doped ZnO nanoparticles prepared by sol–gel method

et al. 2015

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Mg-doped ZnO (Mg x Zn 1-x O, x = 0-0.10) nanoparticles were prepared by sol-gel method. Structural characterization by X-ray diffraction (XRD) indicates that the lattice parameter a increases and c decreases linearly with the increase in Mg content (x) due to the substitution of Mg 2? for Zn 2? in ZnO lattice. The blueshift of Raman modes is observed, impling the increase in force constant of atom vibration in the Mg x Zn 1-x O (MgZnO) nanoparticles. Resonant Raman spectra show longitudinal optical phonon overtones up to fifth order, revealing that the short part of the electron-phonon interaction is enhanced and long-range part is weakened by Mg doping.

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Section: Resultssupporting

confidence: 72%

Structure and Raman scattering of Mg-doped ZnO nanoparticles prepared by sol–gel method

et al. 2015

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“…The Raman mode is softened by the random substitution of Li and Ga with Mg through the composition disorder effect. 1,[27][28][29] Therefore, similar to the case of c-LiGaO 2 , the broadening of P 1 can also be explained by the softening behaviors of the A 1g (LO) mode. 14 Also note that the A 1g (LO) mode of h-LiGaO 2 does not imply the cation but anion movement ( Fig.…”

Section: Resultsmentioning

confidence: 79%

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

Ohfuji

Irifune

et al. 2012

Journal of Applied Physics

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Cation order-disorder phase transitions in LiGaO 2 : Observation of the pathways of ternary wurtzite under high pressure Disorder-activated phonon behaviors of the cubic rocksalt-type semiconductor alloy Li (1Àx)/2 Ga (1Àx)/2 M x O (M ¼ Mg, Zn) prepared by high-pressure and high-temperature method has been studied by Raman scattering analysis. The LO Raman phonon in Li (1Àx)/2 Ga (1Àx)/2 M x O was found to exhibit a distinct two-mode behavior. The compositional dependence of Raman frequency, peakwidth, 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 (1Àx)/2 Ga (1Àx)/2 M x O can be interpreted as a composite mode of the softening Brillouin zone center mode and the Brillouin zone edge mode. V C 2012 American Institute of Physics. [http://dx.

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“…The real-space structural details are revealed through the Fourier transformation 13 . The PDF analysis has been proven to be a very successful technique to investigate the local structure changes in many oxide materials [13][14][15] . Among other methods capable to disclose structural changes are for instance x-ray and neutron diffraction and extended X-ray absorption fine structure (EXAFS).…”

Section: Introductionmentioning

confidence: 99%

Crystal structure transformation in CeRuSn seen via the atomic pair distribution function

et al. 2014

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We report on the atomic pair distribution function determination in the ternary compound CeRuSn using high energy synchrotron x-ray diffraction. Above room temperature CeRuSn orders in a monoclinic structure that is related to the CeCoAl type of structure by a doubling of the c-axis parameter. Upon cooling a very broad hysteretic structural transition has been observed in CeRuSn leading to an ill-defined structure with a main component having three times larger c parameter. The pair distribution functions collected between 90 K and 315 K suggest that the local symmetry type does not change significantly during the phase transformation. However, anomalously large atomic displacement factors suggest that a wide distribution of interatomic distances exists in the sample. Limited agreement between the data at 90 K and the best fit suggests that the structure with three times larger c lattice parameter with respect to the CeCoAl type can only be regarded as an approximation to the real crystal structure of CeRuSn at low temperatures.

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Evolution of local structures in polycrystallineZn1−xMgxO(<

Cited by 56 publications

References 53 publications

Structure and Raman scattering of Mg-doped ZnO nanoparticles prepared by sol–gel method

Structure and Raman scattering of Mg-doped ZnO nanoparticles prepared by sol–gel method

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

Crystal structure transformation in CeRuSn seen via the atomic pair distribution function

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