## Structural and magnetic phase transitions in mineralsThis volume in Advances in Physical Geochemistry presents the latest synthesis of theory and experimental data pertaining to structural and magnetic phase transitions in a variety of geochemically important minerals. The book is the first to cover the impact of this rapidly progressing area of solid state physics in earth sciences and reflects its growing significance for mineralogy and petrology. |

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Page 93

The

around the two axes. The Theoretical Model Our objective is to construct a

mathematical model of MgSiO, perovskite that is capable of yielding its

thermodynamic ...

The

**orthorhombic**structure results on coordinated rotations of the octahedraaround the two axes. The Theoretical Model Our objective is to construct a

mathematical model of MgSiO, perovskite that is capable of yielding its

thermodynamic ...

Page 134

This is in sharp contrast to the tetragonal (rutile structure)-

structure) transition in the model SiO2 system. In this case, the transition is

reversible; at ~ 140 GPa the tetragonal form converts to the

an MD ...

This is in sharp contrast to the tetragonal (rutile structure)-

**orthorhombic**(CaCl2structure) transition in the model SiO2 system. In this case, the transition is

reversible; at ~ 140 GPa the tetragonal form converts to the

**orthorhombic**form inan MD ...

Page 148

Specific heat of ilvaite (Seriphos) from 300 to 500 K. The smooth curve is from a

sample that had previously been heated to 750 K (after Robie et al., 1987).

electron-delocalized (

increasing ...

Specific heat of ilvaite (Seriphos) from 300 to 500 K. The smooth curve is from a

sample that had previously been heated to 750 K (after Robie et al., 1987).

electron-delocalized (

**orthorhombic**) phase is stabilized as a function of bothincreasing ...

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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 | |

7 other sections not shown

### 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 |

### Common terms and phrases

anisotropy ANNNI model antiferromagnetic approximation atoms axis Bachheimer Ballet behavior berlinite Bukowinski calculated canting cation distributions Chem chemical cluster Coey composition conﬁguration coupling crystal ﬁeld crystal structure crystallographic decreases deﬁned density disordered Dolino Earth Planet electron entropy equilibrium experimental Fe2SiO feldspar ferromagnetic ﬁrst ﬁt free energy Geophys Ghose grunerite 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 MgSiO Mineral Mn2SiO4 mode Mossbauer neutron diffraction observed octahedral olivines orbital order parameter orthopyroxene orthorhombic pairs Pbl2 perovskite phase diagrams phase transition Phys polytypes polytypic phases predicted pyroxenes quartz reﬂections Salje sample shown in Fig silicates SiO2 solid solutions speciﬁc heat spin glass susceptibility symmetry temperature dependence thermal expansion thermodynamic tion transformation X-ray zero pressure