Structural and Magnetic Phase Transitions in Minerals |
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Page 7
The most traditional way to measure the order parameter is to follow the temperature evolution of lattice parameters . However , it is necessary to know which lattice parameters ( or combination of lattice parameters ) reflect the order ...
The most traditional way to measure the order parameter is to follow the temperature evolution of lattice parameters . However , it is necessary to know which lattice parameters ( or combination of lattice parameters ) reflect the order ...
Page 94
where U ( X ) is the static lattice energy , Fih is the thermal contribution to the free energy , and V is the volume . The thermal contribution to the free energy is calculated in the quasiharmonic approximation Fon ( , X ) = 15hv ( X ) ...
where U ( X ) is the static lattice energy , Fih is the thermal contribution to the free energy , and V is the volume . The thermal contribution to the free energy is calculated in the quasiharmonic approximation Fon ( , X ) = 15hv ( X ) ...
Page 99
Because the quasiharmonic lattice becomes unstable as the critical transformations are approached , it was not possible to calculate equilibrium angles beyond the temperatures indicated by the small open and filled circles .
Because the quasiharmonic lattice becomes unstable as the critical transformations are approached , it was not possible to calculate equilibrium angles beyond the temperatures indicated by the small open and filled circles .
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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 |
Common terms and phrases
antiferromagnetic appears applied approximation atoms axis Ballet behavior bond calculated cation Chem chemical cluster Coey components composition constant corresponding coupling critical crystal decreases density dependence described determined diffraction direction disordered Dolino effect electron energy equilibrium estimated et al exchange experimental experiments Fe2+ ferromagnetic field function Ghose give given heat ilvaite inc phase increases indicate interactions ions iron lattice layers Lindsley lower mantle magnetic magnetic order materials measurements Mineral mode Mössbauer natural neutron observed obtained occur octahedral olivines order parameter pairs perovskite phase diagrams phase transition Phys physical pigeonite polytypes positions possible potential predicted pressure properties pyroxenes quartz range respectively Salje sample shown shows silicates solid solution space group spin stability structure symmetry Table temperature theory thermodynamic tion transformation unit variation