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- W1974025653 abstract "The room-temperature elastic moduli ${C}_{mathrm{IJ}}$ corresponding to the pure longitudinal and transverse modes in single crystals of the wurtzite phase of ZnO have been determined from ultrasonic wave velocities measurements as a function of pressure up to 10 GPa. All the moduli exhibit a linear dependence on pressure, with positive values for the longitudinal moduli ${(dC}_{11}/dP=5.32$ and ${mathrm{dC}}_{33}/dP=3.78)$ but negative values for the shear moduli ${(dC}_{44}/dP=ensuremath{-}0.35$ and ${mathrm{dC}}_{66}/dP=ensuremath{-}0.30).$ All modes exhibit anomalous travel time above ${P}_{mathrm{Tr}}=7.5mathrm{GPa},$ indicating the onset of a transition to the rocksalt $(B1)$ phase. Using recent improvements for ultrasonic measurements in multianvil apparatus, this experimental study on the phase-transformation mechanism is extended to simultaneous high pressures and high temperatures. At high temperatures, ${P}_{mathrm{Tr}}$ decrease and the pressure derivatives of the elastic shear modes become more negative. Thus, the elastic shear softening observed at room temperature is enhanced at elevated temperatures." @default.
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- W1974025653 date "2001-05-11" @default.
- W1974025653 modified "2023-09-23" @default.
- W1974025653 title "Pressure-induced softening of shear modes in ZnO" @default.
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- W1974025653 doi "https://doi.org/10.1103/physrevb.63.224105" @default.
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