Structural and Magnetic Phase Transitions in Minerals |
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Page 195
We designate them by three signs , corresponding respectively to the three generators mentioned above . A minus sign means that the generator is combined with 7. As the M1 sites , numbered from 1 to 4 ( Fig .
We designate them by three signs , corresponding respectively to the three generators mentioned above . A minus sign means that the generator is combined with 7. As the M1 sites , numbered from 1 to 4 ( Fig .
Page 200
Figure 12a corresponds to the case M = Mn . Here à , is weak and < Ss > / < S , > increases with temperature ( Fig . 4 ) . Then the exchange term curve moves upward and a decreases rapidly , until at some temperature Tk the curve passes ...
Figure 12a corresponds to the case M = Mn . Here à , is weak and < Ss > / < S , > increases with temperature ( Fig . 4 ) . Then the exchange term curve moves upward and a decreases rapidly , until at some temperature Tk the curve passes ...
Page 201
The multiple curves correspond to the term on the left in formula ( 1 ) ( exchange ) with values of < S5 > < S , > equal to 1 , 1.5 , and 2. The other curve corresponds to the term on the right ( anisotropy ) ; it has a value amounting ...
The multiple curves correspond to the term on the left in formula ( 1 ) ( exchange ) with values of < S5 > < S , > equal to 1 , 1.5 , and 2. The other curve corresponds to the term on the right ( anisotropy ) ; it has a value amounting ...
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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 |
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