Structural and Magnetic Phase Transitions in Minerals |
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Page 219
... transformed back to the 2H structure . The time neces- sary for the back transformation varied between 2 and 10 weeks . No correlation was observed between the thermal history of the sample and the rate of back transformation , which is ...
... transformed back to the 2H structure . The time neces- sary for the back transformation varied between 2 and 10 weeks . No correlation was observed between the thermal history of the sample and the rate of back transformation , which is ...
Page 229
... transformation rates are possible . The true value of the latent heat is therefore expected to be slightly higher than the observed value of L and ranges between 270 and 350 J / mol . The transformation temperatures observed in the ...
... transformation rates are possible . The true value of the latent heat is therefore expected to be slightly higher than the observed value of L and ranges between 270 and 350 J / mol . The transformation temperatures observed in the ...
Page 230
... transformation process can be understood as being due to pinning of the transformation front by defects . The observed activation energy is then essentially related to the energy needed to unpin the growing layer or to create a new ...
... transformation process can be understood as being due to pinning of the transformation front by defects . The observed activation energy is then essentially related to the energy needed to unpin the growing layer or to create a new ...
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