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- W2017476089 abstract "The compound Ag2O undergoes large and isotropic negative thermal expansion over 0–500 K. We report temperature dependent inelastic neutron scattering measurements and ab-initio calculations of the phonon spectrum. The temperature dependence of the experimental phonon spectrum shows strong anharmonic nature of phonon modes of energy around 2.4 meV. The ab-initio calculations reveal that the maximum negative Grüneisen parameter, which is a measure of the relevant anharmonicity, occurs for the transverse phonon modes that involve bending motions of the Ag4O tetrahedra. The thermal expansion is evaluated from the ab-initio calculation of the pressure dependence of the phonon modes, and found in good agreement with available experimental data." @default.
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- W2017476089 date "2012-06-01" @default.
- W2017476089 modified "2023-10-18" @default.
- W2017476089 title "Inelastic neutron scattering an ab-initio calculation of negative thermal expansion in Ag2O" @default.
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- W2017476089 doi "https://doi.org/10.1016/j.physb.2012.02.023" @default.
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