Structural and Magnetic Phase Transitions in Minerals |
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Page 95
... potential energy from O - O , Si - O , and Mg - O ( Ca - O ) short- range pair potentials in the cubic perovskite structure . The lattice dimension is parameterized by the Si - O bond length . The labeled arrows indicate the Si - O bond ...
... potential energy from O - O , Si - O , and Mg - O ( Ca - O ) short- range pair potentials in the cubic perovskite structure . The lattice dimension is parameterized by the Si - O bond length . The labeled arrows indicate the Si - O bond ...
Page 101
... potential barriers separating it from the low - pressure phase are very low . In this regard , it is interesting to note that at high pressures the model static lattice is unstable in the cubic structure ( Fig . 4 ) . However , the ...
... potential barriers separating it from the low - pressure phase are very low . In this regard , it is interesting to note that at high pressures the model static lattice is unstable in the cubic structure ( Fig . 4 ) . However , the ...
Page 132
... potential model for the SiO2 system in which Si is in six- fold coordination . The Gilbert - type potential function ( Gilbert , 1968 ) with a disper- sion term Ujj ( rij ) = qi9j Tij -6 - C¡¡rij + fo ( b ; + b ; ) exp a ; 1⁄2 a ; - r 1 ...
... potential model for the SiO2 system in which Si is in six- fold coordination . The Gilbert - type potential function ( Gilbert , 1968 ) with a disper- sion term Ujj ( rij ) = qi9j Tij -6 - C¡¡rij + fo ( b ; + b ; ) exp a ; 1⁄2 a ; - r 1 ...
Contents
Incommensurate Phase Transitions in Quartz and Berlinite | 17 |
Phase Separation in Quadrilateral Pyroxenes and Olivines | 39 |
Multicritical Phase Relations in Minerals | 60 |
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Structural and Magnetic Phase Transitions in Minerals S. Ghose,J.M.D. Coey,E. Salje Limited preview - 2012 |
Structural and Magnetic Phase Transitions in Minerals S. Ghose,J.M.D. Coey,E. Salje Snippet view - 1988 |
Structural and Magnetic Phase Transitions in Minerals S. Ghose,J.M.D. Coey,E. Salje Snippet view - 1988 |
Common terms and phrases
a-ẞ transition anisotropy ANNNI model antiferromagnetic approximation atoms axis Bachheimer Ballet behavior berlinite Bukowinski calculated canting Chem chemical Co₂SiO4 Coey components composition coupling crystal field crystal structure crystallographic Davidson decreases density Di-En disordered Dolino Earth Planet electron equilibrium experimental Fe² Fe2+ Fe2SiO4 Fe³ feldspar ferromagnetic free energy Geophys Ghose grunerite high pressure high-spin ilvaite inc phase incommensurate phase interactions ions Jeanloz Landau theory lattice layers Lindsley low temperatures lower mantle LS transition M2 sites magnetic order magnetic phase transitions magnetic properties magnetic structure Matsui measurements MgSiO3 Mineral Mn2SiO4 mode Mössbauer neutron diffraction observed octahedral olivines order parameter orthopyroxene orthorhombic pairs perovskite phase diagrams phase transition Phys polytypes polytypic phases predicted pyroxenes quartz Salje sample shown in Fig silicates SiO2 solid solution space group spin glass ẞ phase susceptibility symmetry temperature dependence thermal expansion thermodynamic tion transformation X-ray zero pressure