Structural and Magnetic Phase Transitions in MineralsThis volume in Advances in Physical Geochemistry presents the latest synthesis of theory and experimental data pertaining to structural and magnetic phase transitions in a variety of geochemically important minerals. The book is the first to cover the impact of this rapidly progressing area of solid state physics in earth sciences and reflects its growing significance for mineralogy and petrology. |
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Page 113
Chapter 6 High - Spin to Low - Spin Transition of Iron ( II ) Oxides at High Pressures : Possible Effects on the Physics and Chemistry of the Lower Mantle David M. Sherman Introduction Magnesiowüstite ( Mg , Fe ) and silicate perovskite ...
Chapter 6 High - Spin to Low - Spin Transition of Iron ( II ) Oxides at High Pressures : Possible Effects on the Physics and Chemistry of the Lower Mantle David M. Sherman Introduction Magnesiowüstite ( Mg , Fe ) and silicate perovskite ...
Page 114
between electrons with parallel spins . The difference is the exchange stabilization energy Vex . The state with the maximum spin will have the most parallel electrons and , hence , the greatest exchange stabilization energy .
between electrons with parallel spins . The difference is the exchange stabilization energy Vex . The state with the maximum spin will have the most parallel electrons and , hence , the greatest exchange stabilization energy .
Page 115
Spin down Spin down Spin up Spin up 10D 10 Da eg 0 Energy eg VEX Uex t2g t2g High - spin configuration stable Low - spin configuration stable Fig . 1. Schematic d - orbital energy level diagrams for the cases when 10Dq < Vex ( highspin ...
Spin down Spin down Spin up Spin up 10D 10 Da eg 0 Energy eg VEX Uex t2g t2g High - spin configuration stable Low - spin configuration stable Fig . 1. Schematic d - orbital energy level diagrams for the cases when 10Dq < Vex ( highspin ...
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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 |
Common terms and phrases
antiferromagnetic appears applied approximation atoms axis Ballet behavior bond calculated cation Chem chemical cluster Coey components composition constant corresponding coupling critical crystal decreases density dependence described determined diffraction direction disordered Dolino effect electron energy equilibrium estimated et al exchange experimental experiments Fe2+ Fe3+ ferromagnetic field function Ghose give given heat ilvaite inc phase increases indicate interactions ions iron lattice layers Lindsley lower mantle magnetic magnetic order materials measurements Mineral mode Mössbauer natural neutron observed obtained occur octahedral olivines order parameter pairs perovskite phase diagrams phase transition Phys physical pigeonite polytypes positions possible potential predicted pressure properties pyroxenes quartz range respectively Salje sample shown shows silicates solid solution space group spin stability structure symmetry Table temperature theory thermodynamic tion transformation unit variation