Structural and Magnetic Phase Transitions in Minerals |
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Page 41
... entropy , Sc , is given by 13 23 SCREE X In X. = - If we expand Hmix for ternary Fe - Mg - Ca pyroxenes in which XcM is zero , there will be 10 terms : 5 ! / ( 2 ! 3 ! ) . These arise from intrasite interactions ( more familiar as WMI ...
... entropy , Sc , is given by 13 23 SCREE X In X. = - If we expand Hmix for ternary Fe - Mg - Ca pyroxenes in which XcM is zero , there will be 10 terms : 5 ! / ( 2 ! 3 ! ) . These arise from intrasite interactions ( more familiar as WMI ...
Page 233
... entropy . The excess free energy disappears at the transition temperature T1r , and AH = Tt AS = With AH = L = 300 J / mol and Ttr 370 K , the excess entropy becomes 0.65 J / K⚫mol , a very small quantity . The temperature evolution of ...
... entropy . The excess free energy disappears at the transition temperature T1r , and AH = Tt AS = With AH = L = 300 J / mol and Ttr 370 K , the excess entropy becomes 0.65 J / K⚫mol , a very small quantity . The temperature evolution of ...
Page 234
... entropy of mixing , which is related to the stacking pattern alone , is irrelevant in the thermodynamic limit , because it increases with increasing size of the crystal as the number of interfaces N and not as the number of atoms No3 ...
... entropy of mixing , which is related to the stacking pattern alone , is irrelevant in the thermodynamic limit , because it increases with increasing size of the crystal as the number of interfaces N and not as the number of atoms No3 ...
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