Neutron and nuclear inelastic scattering study of the Einstein oscillators in Ba-, Sr-, and Eu-filled germanium clathrates

Article

关键词: DENSITY-OF-STATES;    THERMAL-CONDUCTIVITY;    THERMOELECTRIC PROPERTIES;    STRUCTURAL DISORDER;    RESONANT SCATTERING;    GE;    SEMICONDUCTORS;    SR8GA16GE30;    RADIATION;    GUEST;   

DOI  :  10.1103/PhysRevB.72.174301

来源: SCIE

【 摘 要 】

Inelastic neutron scattering measurements on Ba8Ga16Ge30 and Sr8Ga16Ge30 indicate the presence of soft local modes with Einstein oscillator energies of 4.9 +/- 0.1 and 4.4 +/- 0.1 meV, modes which are associated with the lowest rattling mode of the Ba(B) and Sr(B) guests, respectively. Nuclear inelastic scattering measurements on Eu8Ga16Ge30 yield Einstein oscillator energies of between 3.0 +/- 0.3 and 7.5 +/- 1.2 meV for the different modes of the Eu guests. Further, the resonant character of the measurements on Eu8Ga16Ge30 reveals, without question, that neither of the Eu guests exhibit any vibrational modes above 9 meV.

【 授权许可】

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