Structural and Magnetic Phase Transitions in Minerals |
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Page 19
... atomic level ( Smolenskii , 1984 ) . In some cases , the high - temperature phase is not a perfectly periodic structure but some atoms can be distributed randomly between symmetry - related positions . At the atomic scale the structure ...
... atomic level ( Smolenskii , 1984 ) . In some cases , the high - temperature phase is not a perfectly periodic structure but some atoms can be distributed randomly between symmetry - related positions . At the atomic scale the structure ...
Page 20
... atomic positions : a silicon atom is at ( 1⁄2 , 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 ...
... atomic positions : a silicon atom is at ( 1⁄2 , 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 ...
Page 137
... atom in terms of surrounding oxygen atoms is 13 ) , whereas silicon atoms are arranged in the regular face - centered cubic array . Possible Existence of Silica and Analogous Oxides with Pa3 Symmetry The pair correlation functions ( or ...
... atom in terms of surrounding oxygen atoms is 13 ) , whereas silicon atoms are arranged in the regular face - centered cubic array . Possible Existence of Silica and Analogous Oxides with Pa3 Symmetry The pair correlation functions ( or ...
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