Structural and Magnetic Phase Transitions in Minerals |
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Page 17
... SiO4 tetrahedra are connected , the SiO4 tetrahedra being the building blocks of all SiO2 polymorphs except stishovite . The transforma- tion from one of these phases to another is known as a reconstructive transforma- tion , as it ...
... SiO4 tetrahedra are connected , the SiO4 tetrahedra being the building blocks of all SiO2 polymorphs except stishovite . The transforma- tion from one of these phases to another is known as a reconstructive transforma- tion , as it ...
Page 20
... SiO4 tetrahedra arranged in right- or left - handed helices around the c axis . The hexagonal unit cell is a right prism built on a base formed by two equal vectors a and b , making an angle of 120 ° and perpen- dicular to c , with unit ...
... SiO4 tetrahedra arranged in right- or left - handed helices around the c axis . The hexagonal unit cell is a right prism built on a base formed by two equal vectors a and b , making an angle of 120 ° and perpen- dicular to c , with unit ...
Page 203
... SiO4 A powder neutron diffraction study has been performed on three compositions of the solid solution ( Fe , Mn1 - x ) 2 SiO4 , with x = 0.29 , 0.50 , and 0.76 ( Ballet et al . , 1987 ) . At room temperature , the cation distribution ...
... SiO4 A powder neutron diffraction study has been performed on three compositions of the solid solution ( Fe , Mn1 - x ) 2 SiO4 , with x = 0.29 , 0.50 , and 0.76 ( Ballet et al . , 1987 ) . At room temperature , the cation distribution ...
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