Structural and Magnetic Phase Transitions in Minerals |
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Page 72
Higher - Order CVM Approximations The BWA or PA can be regarded as the simplest approximation in a hierarchical set that is defined by the cluster variation method ( CVM ; Kikuchi , 1951 ) . The CVM provides a prescription for writing ...
Higher - Order CVM Approximations The BWA or PA can be regarded as the simplest approximation in a hierarchical set that is defined by the cluster variation method ( CVM ; Kikuchi , 1951 ) . The CVM provides a prescription for writing ...
Page 152
In such a cluster , Fe - Fe bonding occurs through an overlap of the Feq ( t28Feb ( 122 ) orbitals . Provided the Fe - Fe separation is less than 2.95 Å , the overlap results in a cluster molecular orbital analog of the narrow Fe ( 3d ) ...
In such a cluster , Fe - Fe bonding occurs through an overlap of the Feq ( t28Feb ( 122 ) orbitals . Provided the Fe - Fe separation is less than 2.95 Å , the overlap results in a cluster molecular orbital analog of the narrow Fe ( 3d ) ...
Page 213
The instrumental resolution corresponds to cluster sizes above 900 Å . Within these limits no broadening was observed for type 1 samples , while for type II samples the cluster size is roughly 450 ( +100 ) Å . In phase III the cluster ...
The instrumental resolution corresponds to cluster sizes above 900 Å . Within these limits no broadening was observed for type 1 samples , while for type II samples the cluster size is roughly 450 ( +100 ) Å . In phase III the cluster ...
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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 |
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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