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 19
... positions ; on cooling they shift to positions of lower symmetry . In order - disorder as well as in displacive transitions there is a symmetry- breaking , so an order parameter can be defined according to the Landau theory . These two ...
... positions ; on cooling they shift to positions of lower symmetry . In order - disorder as well as in displacive transitions there is a symmetry- breaking , so an order parameter can be defined according to the Landau theory . These two ...
Page 20
... positions : a silicon atom is at ( 2 , 0,0 ) and an oxygen atom is at ( x , x / 2 ,, 1/6 ) with x = 0.414 . The positions of the other atoms can be obtained by the sym- metry operations of quartz , namely a sixfold screw axis along c ...
... positions : a silicon atom is at ( 2 , 0,0 ) and an oxygen atom is at ( x , x / 2 ,, 1/6 ) with x = 0.414 . The positions of the other atoms can be obtained by the sym- metry operations of quartz , namely a sixfold screw axis along c ...
Page 230
... positions in reciprocal space are not identical to those of the pure 12R material . With increasing degree of transformation , the reflections sharpen and move to their final positions . These observations are affected by early stages ...
... positions in reciprocal space are not identical to those of the pure 12R material . With increasing degree of transformation , the reflections sharpen and move to their final positions . These observations are affected by early stages ...
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