Structural and Magnetic Phase Transitions in Minerals |
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Page 20
... angle of 120 ° and perpen- dicular to c , with unit cell parameters a = b = 5.0 Å and c = 5.46 Å . Although the unit cell contains three SiO2 groups , only one free parameter is needed to define the atomic positions : a silicon atom is ...
... angle of 120 ° and perpen- dicular to c , with unit cell parameters a = b = 5.0 Å and c = 5.46 Å . Although the unit cell contains three SiO2 groups , only one free parameter is needed to define the atomic positions : a silicon atom is ...
Page 97
... angles 0 and o as the temperature is raised . These angles are not well defined when the SiO6 octahedra are distorted . Therefore , we show in Fig . 7 the angles corresponding to calculations with regular octahedra . The temper- ature ...
... angles 0 and o as the temperature is raised . These angles are not well defined when the SiO6 octahedra are distorted . Therefore , we show in Fig . 7 the angles corresponding to calculations with regular octahedra . The temper- ature ...
Page 225
... angle ( or conductivity ) at temperatures above 370 K. Kinetic experiments showed that this increase is not ... angles . It was therefore concluded that the complex resonance structure of the dielectric function at frequencies below ...
... angle ( or conductivity ) at temperatures above 370 K. Kinetic experiments showed that this increase is not ... angles . It was therefore concluded that the complex resonance structure of the dielectric function at frequencies below ...
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