## 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 4

The

parameters QB and Qod,Bg- (In tne following we drop the index Bg of the active

representation.^ AFm = \a& + \bQ* + \c(f + \ aj^ + \ bj^ + \ codQ^+ WW + c/%)Q + (B

+ ...

The

**free energy**of the Na-feldspar can then be expressed using the two orderparameters QB and Qod,Bg- (In tne following we drop the index Bg of the active

representation.^ AFm = \a& + \bQ* + \c(f + \ aj^ + \ bj^ + \ codQ^+ WW + c/%)Q + (B

+ ...

Page 94

where f/(X) is the static lattice energy, Fth is the thermal contribution to the

calculated in the quasiharmonic approximation Fth(r, X) = E [ ħAv,(X) + kT ln(l -

exp(-fcv ...

where f/(X) is the static lattice energy, Fth is the thermal contribution to the

**free****energy**, and V is the volume. The thermal contribution to the**free energy**iscalculated in the quasiharmonic approximation Fth(r, X) = E [ ħAv,(X) + kT ln(l -

exp(-fcv ...

Page 117

... itinerant electrons) since the Fe-Fe interatomic distance in low- spin FeO will

be less than 2.84 A. Estimation of HS — LS Transition Pressure of Iron(II) Oxides

and Silicates in the Earth's Interior At constant T and P, the

...

... itinerant electrons) since the Fe-Fe interatomic distance in low- spin FeO will

be less than 2.84 A. Estimation of HS — LS Transition Pressure of Iron(II) Oxides

and Silicates in the Earth's Interior At constant T and P, the

**free energy**of the HS...

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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 |

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

### Common terms and phrases

a-P transition anisotropy ANNNI model antiferromagnetic approximation atoms axis Bachheimer Ballet behavior berlinite Bukowinski calculated canting Chem chemical cluster Coey components composition coupling crystal field crystal structure crystallographic cubic Davidson decreases density disordered Dolino Earth Planet electron entropy equilibrium etal experimental Fe2+ and Fe3+ feldspar ferromagnetic free energy Geophys Ghose high pressure high-spin ilvaite inc phase incommensurate phase interactions Jeanloz Landau theory layers Lindsley long-range order low temperatures low-spin lower mantle LS transition M2 sites magnetic order Magnetic Phase Transitions magnetic properties magnetic structure Matsui measurements MgSi03 perovskite Mineral Mossbauer neutron diffraction observed octahedral olivines orbital order parameter orthopyroxene orthorhombic oxides pairs PbI2 perovskite phase diagrams phase of quartz phase transition Phys polytypic polytypic phases predicted pyroxenes quartz Salje sample shown in Fig solid solutions space group spin glass susceptibility symmetry temperature dependence thermal expansion thermodynamic tion transformation X-ray zero pressure