Structural and Magnetic Phase Transitions in Minerals |
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Page 113
... high pressures , octahedrally coordinated Fe2 + cations are expected to undergo a high - spin ( S = 2 ) to low - spin ( S = 0 ) transition . Such a transition in magnesiowüstite might have implications for the physics and chemistry of ...
... high pressures , octahedrally coordinated Fe2 + cations are expected to undergo a high - spin ( S = 2 ) to low - spin ( S = 0 ) transition . Such a transition in magnesiowüstite might have implications for the physics and chemistry of ...
Page 114
... high - spin state ( S = 2 ) will be the most stable as long as Uex > 10Dq . When we decrease the Fe - O bond length , however , we will increase 10Dq so that , eventually , Uex ... Spin up Spin down Spin down Spin up 114 D.M. Sherman SHERMAN.
... high - spin state ( S = 2 ) will be the most stable as long as Uex > 10Dq . When we decrease the Fe - O bond length , however , we will increase 10Dq so that , eventually , Uex ... Spin up Spin down Spin down Spin up 114 D.M. Sherman SHERMAN.
Page 115
Subrata Ghose J. M. D. Coey, Ekhard K. H. Salje. Energy t2g Spin up Spin down Spin down Spin up 10Dq 10Dq eg UEX UEX t2g High - spin configuration stable Low - spin configuration stable Fig . 1. Schematic d - orbital energy level ...
Subrata Ghose J. M. D. Coey, Ekhard K. H. Salje. Energy t2g Spin up Spin down Spin down Spin up 10Dq 10Dq eg UEX UEX t2g High - spin configuration stable Low - spin configuration stable Fig . 1. Schematic d - orbital energy level ...
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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Other editions - View all
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