Structural and Magnetic Phase Transitions in MineralsS. Ghose, J.M.D. Coey, E. Salje This 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 73
... entropy expressions can be found in the above references , and discussions of the specific internal energy models that were used to generate phase diagrams are summarized below . Rhombohedral Carbonates Crystal Structures The crystal ...
... entropy expressions can be found in the above references , and discussions of the specific internal energy models that were used to generate phase diagrams are summarized below . Rhombohedral Carbonates Crystal Structures The crystal ...
Page 122
... Entropy Change During HS - - LS Transition The entropy change during the HS → LS transition has several components . First , there is the simple change in electronic entropy . For a state with spin S there are 25 + 1 degenerate ...
... Entropy Change During HS - - LS Transition The entropy change during the HS → LS transition has several components . First , there is the simple change in electronic entropy . For a state with spin S there are 25 + 1 degenerate ...
Page 233
... entropy . The excess free energy disappears at the transition temperature Tr , and AH = T AS tr With ΔΗ = L = 300 J / mol and Ttr = 370 K , the excess entropy becomes 0.65 J / K⚫mol , a very small quantity . The temperature evolution ...
... entropy . The excess free energy disappears at the transition temperature Tr , and AH = T AS tr With ΔΗ = L = 300 J / mol and Ttr = 370 K , the excess entropy becomes 0.65 J / K⚫mol , a very small quantity . The temperature evolution ...
Contents
Preface | 1 |
Incommensurate Phase Transitions in Quartz and Berlinite | 17 |
Phase Separation in Quadrilateral Pyroxenes and Olivines | 39 |
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 |
Common terms and phrases
a-ẞ transition anisotropy ANNNI model antiferromagnetic atoms axis Bachheimer Ballet behavior berlinite Bukowinski calculated canting cation distributions Chem chemical cluster Co₂SiO4 Coey components composition coupling crystal field crystal structure crystallographic decreases density disordered Dolino Earth Planet electron entropy equilibrium experimental Fe² Fe2+ Fe2SiO4 Fe³ feldspar ferromagnetic free energy Fuess Geophys Ghose grunerite high-spin ilvaite inc phase incommensurate phase interactions ions Jeanloz Landau theory lattice layers Lindsley long-range order low temperatures lower mantle LS transition M2 sites magnetic order Magnetic properties magnetic structure Matsui measurements MgSiO3 Mineral Mn2SiO4 Mössbauer neutron diffraction observed octahedral olivines orbital order parameter orthopyroxene orthorhombic oxides pairs perovskite phase diagrams phase transition Phys polytypes polytypic phases predicted pyroxenes quartz Salje sample shown in Fig silicates SiO2 solid solutions space group spin glass ẞ phase susceptibility symmetry temperature dependence thermal expansion thermodynamic tion transformation X-ray zero pressure