Titlebook: Structural and Magnetic Phase Transitions in Minerals; S. Ghose,J. M. D. Coey,E. Salje Conference proceedings 1988 Springer-Verlag New Yor

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,Toward a Thermodynamic Understanding of Feldspars: Order Parameters of Na-Feldspar and the Iī–Pī Phr (Salje . 1985a). It has also been shown that most results of earlier investigations of lattice parameters (e.g., Grundy and Brown, 1969; see Smith, 1974, for review) and domain patterns in feldspars (Brown and Parsons, 1983; Fitzgerald and McLaren, 1982) can now be understood within the framework of Landau theory (Salje, 1985; Salje . 1985b).

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Multicritical Phase Relations in Minerals, second-order transitions change into first-order transitions are called multicritical points, a category that includes tricritical points, critical end points, bicritical points, and tetracritical points, as discussed below.

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Equation of State and Possible Critical Phase Transitions in MgSiO3 Perovskite at Lower-Mantle Condof chemical models are highly nonunique and the subject of some speculation. It can be said, with only minor exaggeration, that our knowledge of the “chemical map” of the earth has not advanced very far from that first drafted by Birch in his classic paper (Birch, 1952).

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High-Spin to Low-Spin Transition of Iron(II) Oxides at High Pressures: Possible Effects on the Physates of the free energy for the HS → LS transition of FeO as a function of pressure and temperature. Using an approximate mantle geotherm, the depth at which low-spin FeO becomes stable relative to high-spin FeO is estimated.

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Incommensurate Phase Transitions in Quartz and Berlinite,s by Frondel, 1962; Sosman, 1965). Under usual conditions, the stable phase is crystalline quartz; several other phases exist at high temperature and high pressure. The structures of these phases differ in the way the SiO. tetrahedra are connected, the SiO. tetrahedra being the building blocks of al

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Phase Separation in Quadrilateral Pyroxenes and Olivines,ilable for cation substitution. Solution models that incorporate explicit pairwise cation-cation interactions successfully treat phase equilibria in these ternary systems where traditional ternary solution models (e.g., the regular solution model; discussed by many, including Andersen and Lindsley,

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