Structural and Magnetic Phase Transitions in Minerals |
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Page 18
... existence of the inc phase , which can be considered as a small perturbation in the a - ẞ transition within the framework of Landau theory . Then we present the main properties of the inc phase : a description of the triangular ...
... existence of the inc phase , which can be considered as a small perturbation in the a - ẞ transition within the framework of Landau theory . Then we present the main properties of the inc phase : a description of the triangular ...
Page 26
... existence of crystals where atomic positions or electronic properties are modulated with a period that is incom- mensurate ( inc ) with that of the basic lattice ( Blinc and Levanyuk , 1986 ) . A charac- teristic feature of these inc ...
... existence of crystals where atomic positions or electronic properties are modulated with a period that is incom- mensurate ( inc ) with that of the basic lattice ( Blinc and Levanyuk , 1986 ) . A charac- teristic feature of these inc ...
Page 33
... existence of a minimum frequency at the finite value of qo = 0.035a * with a frequency that decreases near T ;. At a high tempera- ture ( 1150 K ) the soft - mode branch appears as a well - defined excitation , confirming the displacive ...
... existence of a minimum frequency at the finite value of qo = 0.035a * with a frequency that decreases near T ;. At a high tempera- ture ( 1150 K ) the soft - mode branch appears as a well - defined excitation , confirming the displacive ...
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