Structural and Magnetic Phase Transitions in Minerals |
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Page 129
... SiO2 with the fluorite structure have been carried out by Hemley et al . ( 1985 ) and Bukowinski and Wolf ( 1986 ) . Their results indicate that the SiO2 - fluorite phase may be at least metastable provided the pressure is extremely ...
... SiO2 with the fluorite structure have been carried out by Hemley et al . ( 1985 ) and Bukowinski and Wolf ( 1986 ) . Their results indicate that the SiO2 - fluorite phase may be at least metastable provided the pressure is extremely ...
Page 132
... SiO2 During more than several hundred MD runs on the model SiO2 - fluorite , the new phase appeared only once . Usually the SiO2 - fluorite transforms to the a - PbO2 struc- ture or phases closely related to it with high yield in the ...
... SiO2 During more than several hundred MD runs on the model SiO2 - fluorite , the new phase appeared only once . Usually the SiO2 - fluorite transforms to the a - PbO2 struc- ture or phases closely related to it with high yield in the ...
Page 137
... SiO2- rutile are compared in Fig . 5. The peaks for Si - O pair are definitely less sharp in Pa3 - SiO2 than in SiO2 - rutile , suggesting greater positional uncertainties of atoms in the former . This may be a sign of the fact that the ...
... SiO2- rutile are compared in Fig . 5. The peaks for Si - O pair are definitely less sharp in Pa3 - SiO2 than in SiO2 - rutile , suggesting greater positional uncertainties of atoms in the former . This may be a sign of the fact that the ...
Contents
Incommensurate Phase Transitions in Quartz and Berlinite | 17 |
Phase Separation in Quadrilateral Pyroxenes and Olivines | 39 |
Multicritical Phase Relations in Minerals | 60 |
Copyright | |
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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