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- W1979142034 endingPage "981" @default.
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- W1979142034 abstract "We study the vibrational properties of amorphous germanium at high pressures using a constant pressure ab initio technique. With the application of pressure, the low-frequency modes gradually soften with a decrease in their acoustic-like nature while the high-frequency modes shift to larger frequencies. The acoustic-like vibrations are found to have negative Grüneisen parameters whereas the optic-like ones have positive values of about +1. A negative thermal expansion is produced below 200 K. Furthermore, we find that pressure reduces the number of localized states. Accompanied by the phase transition into a metallic high-density amorphous state, the nature of the low-frequency vibrations is changed from acoustic-like to optic-like and from bond bending to bond stretching." @default.
- W1979142034 created "2016-06-24" @default.
- W1979142034 creator A5079792523 @default.
- W1979142034 date "2010-05-01" @default.
- W1979142034 modified "2023-10-18" @default.
- W1979142034 title "Vibrational properties of amorphous germanium under pressure and its thermal expansion and Grüneisen parameters" @default.
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- W1979142034 doi "https://doi.org/10.1016/j.jnoncrysol.2010.01.028" @default.
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