## 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

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

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

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 .### What people are saying - Write a review

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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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### Other editions - View all

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