## 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. |

### From inside the book

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Page 1

Chapter 1 Toward a Thermodynamic Understanding of

Parameters of Na-

Introduction Considerable progress has been made in recent years on the

experimental ...

Chapter 1 Toward a Thermodynamic Understanding of

**Feldspars**: OrderParameters of Na-

**Feldspar**and the I1–P1 Phase Transition in Anorthite E. SaljeIntroduction Considerable progress has been made in recent years on the

experimental ...

Page 2

The general sequence of structural phase transitions in

follow the same pattern: C2/m – Ci – II – P1 if no modulated phase occurs. The

modulated phase can, in principle, appear at any point in the sequence: C2/m –

CI ...

The general sequence of structural phase transitions in

**feldspar**must alwaysfollow the same pattern: C2/m – Ci – II – P1 if no modulated phase occurs. The

modulated phase can, in principle, appear at any point in the sequence: C2/m –

CI ...

Page 3

The relative complexity of phase diagrams for

the fact that several ordering schemes lead to phase transitions and that the

respective order parameters are not independent of each other. It is necessary ...

The relative complexity of phase diagrams for

**feldspar**systems originates fromthe fact that several ordering schemes lead to phase transitions and that the

respective order parameters are not independent of each other. It is necessary ...

Page 4

S. Ghose, J.M.D. Coey, E. Salje. The free energy of the Na-

expressed using the two order parameters QB, and Qod.b. (In the following we

drop the index B, of the active representation. 1 1 1 1 1 AF2 = 3 ago i bO4 + 6 co"

+ ...

S. Ghose, J.M.D. Coey, E. Salje. The free energy of the Na-

**feldspar**can then beexpressed using the two order parameters QB, and Qod.b. (In the following we

drop the index B, of the active representation. 1 1 1 1 1 AF2 = 3 ago i bO4 + 6 co"

+ ...

Page 7

The order parameters of

directly accessible to experimental observations. However, several macroscopic

quantities reflect the temperature evolution of the order parameter indirectly.

The order parameters of

**feldspar**are thermodynamic quantities and are notdirectly accessible to experimental observations. However, several macroscopic

quantities reflect the temperature evolution of the order parameter indirectly.

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Thinking about it you me bro

### Contents

1 | |

17 | |

Phase Separation in Quadrilateral Pyroxenes and Olivines | 39 |

Multicritical Phase Relations in Minerals | 60 |

Equation of State and Possible Critical Phase Transitions | 91 |

HighSpin to LowSpin Transition of IronII Oxides | 113 |

Molecular Dynamics Studies of Polymorphism of SiO2 | 129 |

Magnetic Phase Transitions in Silicate Minerals | 162 |

Magnetic Phase Transition in Olivines M2SiO | 185 |

Index 241 | 240 |

### Other editions - View all

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 |

Structural and Magnetic Phase Transitions in Minerals S. Ghose,J.M.D. Coey,E. Salje Snippet view - 1988 |

### Common terms and phrases

0–3 transition anisotropy ANNNI model antiferromagnetic approximation atoms axis Bachheimer Ballet behavior berlinite Bukowinski calculated canting cation distributions Chem chemical cluster Coey components composition coupling crystal field crystal structure crystallographic Davidson decreases density disordered Dolino Earth Planet electron equilibrium experimental Fe2SiO4 feldspar ferromagnetic free energy Geophys Ghose high pressure high-spin ilvaite inc phase incommensurate phase interactions ions Jeanloz Landau theory lattice layers Lindsley long-range order low temperatures lower mantle LS transition M2 sites magnetic order magnetic properties magnetic structure Matsui measurements MgSiO3 perovskite Mineral Mn2SiO4 Mössbauer neutron diffraction observed octahedral olivines orbital order parameter orthopyroxene orthorhombic oxides pairs perovskite phase diagrams phase transition Phys polytypes polytypic phases predicted pyroxenes quartz Salje sample shown in Fig silicates SiO2 SiO4 solid solutions space group spin glass susceptibility symmetry temperature dependence thermal expansion thermodynamic tion transformation X-ray zero pressure