Structural and Magnetic Phase Transitions in Minerals |
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Page 20
... axis along c , a twofold axis along a , and other twofold axes perpendicular to a and c . Depending on the sense of rota- tion of the SiO4 helix , the space group is P6222 or P6422 . On cooling , the atoms shift to less symmetric ...
... axis along c , a twofold axis along a , and other twofold axes perpendicular to a and c . Depending on the sense of rota- tion of the SiO4 helix , the space group is P6222 or P6422 . On cooling , the atoms shift to less symmetric ...
Page 200
... axis in 5 being along b , whereas in 1 it is near c . The spins on M2 align themselves along b , while those on M1 lie in a direction between b and the easy axis in M1 . This compromise between the M1 - M2 exchange interaction ( J15 ...
... axis in 5 being along b , whereas in 1 it is near c . The spins on M2 align themselves along b , while those on M1 lie in a direction between b and the easy axis in M1 . This compromise between the M1 - M2 exchange interaction ( J15 ...
Page 235
... axis , the I - Pb - I sandwiches can be characterized by the axes connecting the next nearest neighbors in the different layers . These axes are tilted with respect to the crystallographic c axis . As illustrated in Fig . 9 , they are ...
... axis , the I - Pb - I sandwiches can be characterized by the axes connecting the next nearest neighbors in the different layers . These axes are tilted with respect to the crystallographic c axis . As illustrated in Fig . 9 , they are ...
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 |
Structural and Magnetic Phase Transitions in Minerals S. Ghose,J.M.D. Coey,E. Salje Snippet view - 1988 |
Common terms and phrases
a-ẞ transition anisotropy ANNNI model antiferromagnetic approximation atoms axis Bachheimer Ballet behavior berlinite Bukowinski calculated canting Chem chemical Co₂SiO4 Coey components composition coupling crystal field crystal structure crystallographic Davidson decreases density Di-En disordered Dolino Earth Planet electron equilibrium experimental Fe² Fe2+ Fe2SiO4 Fe³ feldspar ferromagnetic free energy Geophys Ghose grunerite high pressure 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 MgSiO3 Mineral Mn2SiO4 mode Mössbauer neutron diffraction observed octahedral olivines order parameter orthopyroxene orthorhombic pairs perovskite phase diagrams phase transition Phys polytypes polytypic phases predicted pyroxenes quartz Salje sample shown in Fig silicates SiO2 solid solution space group spin glass ẞ phase susceptibility symmetry temperature dependence thermal expansion thermodynamic tion transformation X-ray zero pressure