Small shear modulus of cubic CaSiO3 perovskite
نویسندگان
چکیده
منابع مشابه
CaSiO3 perovskite at lower mantle pressures
[1] We investigate by first-principles the structural behavior of CaSiO3 perovskite up to lower mantle pressures. We confirm that the cubic perovskite modification is unstable at all pressures. The zero Kelvin structure is stabilized by SiO6 octahedral rotations that lower the symmetry to tetragonal, orthorhombic, rhombohedral, or to a cubic supercell. The resulting structures have comparable e...
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Ab initio molecular dynamics simulations were performed to investigate the elasticity of cubic CaSiO3 perovskite at high pressure and temperature. All three independent elastic constants for cubic CaSiO3 perovskite, C11, C12, and C44, were calculated from the computation of stress generated by small strains. The elastic constants were used to estimate the moduli and seismic wave velocities at t...
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Ab initio molecular dynamic (AIMD) simulations were performed to calculate the equation of state (EOS) of CaSiO3 perovskite at mantle pressure–temperature conditions. At temperatures above 2000 K, even though the hydrostatic crystal structure is metrically tetragonal in the pressure range of 13–123 GPa, the symmetry of the elastic moduli is consistent with cubic symmetry. Our results show that ...
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We report measurements of the static shear modulus of electrorheological (ER) fluids consisting of water-wetted silica microspheres in silicone oil. A shear-annealing method, using creep-recovery (CR) cycles under an external electric field, is used to enhance ER properties of the fluid. The shear-annealing method enables the silica spheres in the ER fluid to form better aligned and denser colu...
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ژورنال
عنوان ژورنال: Geophysical Research Letters
سال: 2015
ISSN: 0094-8276
DOI: 10.1002/2015gl063446