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- W2004897158 abstract "To study the pressure-induced changes of $mathrm{Hf}{mathrm{V}}_{2}{mathrm{O}}_{7}$, energy dispersive synchrotron-based x-ray diffraction and Raman spectroscopy were performed up to $41.7phantom{rule{0.3em}{0ex}}mathrm{GPa}$ and $59phantom{rule{0.3em}{0ex}}mathrm{GPa}$, respectively. X-ray diffraction indicates that $mathrm{Hf}{mathrm{V}}_{2}{mathrm{O}}_{7}$ undergoes two phase transitions between 0 and $42phantom{rule{0.3em}{0ex}}mathrm{GPa}$, the first occurring at $3.7ifmmodepmelsetextpmfi{}0.3phantom{rule{0.3em}{0ex}}mathrm{GPa}$. The second is indicated by a gradual loss of the intensity of the Bragg peaks, suggesting pressure-induced amorphization, and is not complete even at $41.7phantom{rule{0.3em}{0ex}}mathrm{GPa}$. Using the Birch-Murnaghan equation of state to fit the x-ray diffraction data from the low-pressure phase, a bulk modulus of $K=12.8ifmmodepmelsetextpmfi{}0.4phantom{rule{0.3em}{0ex}}mathrm{GPa}$ and a pressure derivative of the bulk modulus, ${K}^{ensuremath{'}}=4.0ifmmodepmelsetextpmfi{}0.5$ is obtained for $mathrm{Hf}{mathrm{V}}_{2}{mathrm{O}}_{7}$. Many of the Raman modes, which at zero pressure are manifolds of closely spaced peaks, separate when $mathrm{Hf}{mathrm{V}}_{2}{mathrm{O}}_{7}$ is placed under pressure. Additionally, under compression there is a loss of the low wave number $(200--550phantom{rule{0.3em}{0ex}}{mathrm{cm}}^{ensuremath{-}1})$ modes by $2.0ifmmodepmelsetextpmfi{}0.2phantom{rule{0.3em}{0ex}}mathrm{GPa}$, and at $4.7ifmmodepmelsetextpmfi{}0.3phantom{rule{0.3em}{0ex}}mathrm{GPa}$ a loss of the high wave number modes $(700--1000phantom{rule{0.3em}{0ex}}{mathrm{cm}}^{ensuremath{-}1})$." @default.
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- W2004897158 date "2004-12-30" @default.
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- W2004897158 title "High-pressure x-ray diffraction and Raman spectroscopy of<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mi mathvariant=normal>Hf</mml:mi><mml:msub><mml:mi mathvariant=normal>V</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant=normal>O</mml:mi><mml:mn>7</mml:mn></mml:msub></mml:mrow></mml:math>" @default.
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- W2004897158 doi "https://doi.org/10.1103/physrevb.70.214114" @default.
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