Structural and Magnetic Phase Transitions in Minerals |
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Page 149
... curve without a maximum . Note that in the specific heat measurements of the unheated sample , the positive deviation from the smooth curve is discernible up to 450 K , indicating the existence of considerable short - range order above ...
... curve without a maximum . Note that in the specific heat measurements of the unheated sample , the positive deviation from the smooth curve is discernible up to 450 K , indicating the existence of considerable short - range order above ...
Page 155
... curve in a powder sample at 120 K. From a Mössbauer spectrum at 80 K , they concluded that the Fe2 + and Fe3 + spins at the A sites are magnetically ordered , whereas Fe2 + ( B - site ) spins are disordered . Subsequently , a second ...
... curve in a powder sample at 120 K. From a Mössbauer spectrum at 80 K , they concluded that the Fe2 + and Fe3 + spins at the A sites are magnetically ordered , whereas Fe2 + ( B - site ) spins are disordered . Subsequently , a second ...
Page 200
... curve moves upward and decreases ✪ 12 rapidly , until at some temperature T1 the curve passes above the nearly horizontal part of the anisotropy term , and ~ 0 . As the only mode of the T ... group that gives antiferromagnetism along ...
... curve moves upward and decreases ✪ 12 rapidly , until at some temperature T1 the curve passes above the nearly horizontal part of the anisotropy term , and ~ 0 . As the only mode of the T ... group that gives antiferromagnetism along ...
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