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- W2896430254 abstract "Carbon dioxide exhibits a richness of high-pressure polymorphs ranging from typical molecular solids to fully extended covalent solids, which, in turn, makes it a very appealing topic of fundamental research in condensed-matter physics and simultaneously provides valuable insights into the routes of developing possibly novel materials with advanced properties. The single-crystal x-ray diffraction (XRD) and Brillouin scattering spectroscopy of $mathrm{C}{mathrm{O}}_{2}ensuremath{-}mathrm{I}$ were performed under high temperature and pressure. Densities, acoustic velocities, and elastic moduli of $mathrm{C}{mathrm{O}}_{2}ensuremath{-}mathrm{I}$ were obtained along 300-, 400-, and 580-K isotherms up to the phase-transition boundaries. $mathrm{C}{mathrm{O}}_{2}ensuremath{-}mathrm{I}$ transforms to phase III and phase IV at room temperature (at 12.19 GPa) and 580 K (at 10.83 GPa), respectively. It was observed that high temperature suppresses pressure-induced stress in single-crystal $mathrm{C}{mathrm{O}}_{2}ensuremath{-}mathrm{I}$. All elastic constants and thermal elasticity parameters of $mathrm{C}{mathrm{O}}_{2}ensuremath{-}mathrm{I}$ were obtained and analyzed using finite-strain theory and thermal equation of state modeling. The ${C}_{11}$, ${C}_{12}$, and ${K}_{S}$ increase almost linearly with pressure, while shear moduli ${C}_{44}$ and G exhibit a downward trend with pressure, showing a noticeable reduction at higher temperature. Elastic anisotropy A is practically independent of pressure along each isotherm and increases from 1.75 to 1.9." @default.
- W2896430254 created "2018-10-26" @default.
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- W2896430254 date "2018-10-15" @default.
- W2896430254 modified "2023-10-16" @default.
- W2896430254 title "Elastic stability of <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mrow><mml:mi mathvariant=normal>C</mml:mi><mml:msub><mml:mi mathvariant=normal>O</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math> phase I under high temperature and pressure" @default.
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- W2896430254 doi "https://doi.org/10.1103/physrevb.98.134107" @default.
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