Structural and Magnetic Phase Transitions in Minerals |
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Page 143
... Fe3 ) Fe2 + Si2O ( OH ) · Ferric character of Fe ( Am ) ( e.v.u. ) 2.2 2.4 2.6 2.8 3.0 80 2.0 20 = TN , 120K Mono Ortho ... ions and [ Si2O , ] groups interconnect these chains . The ( OH ) group forms a common corner of two adjacent A ...
... Fe3 ) Fe2 + Si2O ( OH ) · Ferric character of Fe ( Am ) ( e.v.u. ) 2.2 2.4 2.6 2.8 3.0 80 2.0 20 = TN , 120K Mono Ortho ... ions and [ Si2O , ] groups interconnect these chains . The ( OH ) group forms a common corner of two adjacent A ...
Page 144
... Fe3 + ( A ) 2.662 2.732 2.664 2.760 2.805 2.915 Fe ( A ) 2.319 2.332 2.245 2.294 2.268 2.263 Fe2 + ( B ) 1.938 2.963 ... ions parallel to the c axis . The charge localization process is accompanied by the forma- tion of Fe2 + -Fe3 + ...
... Fe3 + ( A ) 2.662 2.732 2.664 2.760 2.805 2.915 Fe ( A ) 2.319 2.332 2.245 2.294 2.268 2.263 Fe2 + ( B ) 1.938 2.963 ... ions parallel to the c axis . The charge localization process is accompanied by the forma- tion of Fe2 + -Fe3 + ...
Page 180
... ( Fe3 * ) and ( b ) hedenbergite ( Fe2 + ) . ing occurs , and the symmetry ... iron at 80 K ( Ghose et al . , 1984 ) , although the Mössbauer data show that the spins ... ions in dodecahedral sites connected by silica tetrahedra . It is ...
... ( Fe3 * ) and ( b ) hedenbergite ( Fe2 + ) . ing occurs , and the symmetry ... iron at 80 K ( Ghose et al . , 1984 ) , although the Mössbauer data show that the spins ... ions in dodecahedral sites connected by silica tetrahedra . It is ...
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