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Olivine-modified spinel-spinel transitions in the system Mg2SiO4-Fe2SiO4: Calorimetric measurements, thermochemical calculation, and geophysical application
The olivine(α)-modified spinel(β)-spinel (γ) transitions in the system Mg2SiO4-Fe2SiO4 were studied by high-temperature solution calorimetry. Enthalpies of the β-γ and a α-γ transitions in Mg2SiO4 atExpand
Thermodynamics of iron oxides: Part III. Enthalpies of formation and stability of ferrihydrite (~Fe(
Abstract Enthalpies of formation of ferrihydrite and schwertmannite were measured by acid solution calorimetry in 5 N HCl at 298 K. The published thermodynamic data for these two phases and e-Fe2O3Expand
Size-Driven Structural and Thermodynamic Complexity in Iron Oxides
This review summarizes recently measured thermodynamic data on their formation and surface energies and concludes that polymorphs metastable as micrometer-sized or larger crystals can often be thermodynamically stabilized at the nanoscale. Expand
Thermochemistry of rare-earth orthophosphates
The enthalpies of formation for the compounds (RE 3+ )PO 4 , (where RE = Sc, Y, La–Nd, Sm–Lu) were determined by oxide-melt solution calorimetry. Calorimetric measurements were performed in aExpand
Synthesis, characterization, and thermochemistry of K-Na-H3O jarosites
Abstract The thermochemistry of well-characterized synthetic K-H 3 O, Na-H 3 O and K-Na-H 3 O jarosites was investigated. These phases are solid solutions that obey Vegard’s law. Electron probeExpand
Thermochemistry of some pyroxenes and related compounds
Abstract The enthalpies of formation of a number of crystalline silicates from the oxides at 986 K were determined by oxide melt solution calorimetry. The values of ΔH°f, 986, in kcal/mol, are asExpand
Simple spinels; crystallographic parameters, cation radii, lattice energies, and cation distribution
The size of a cation is important in determining its site preference. In oxide spinels containing 2 (super +) and 3+) ions (2-3 spinels) there is a tendency for the larger ion to prefer theExpand
Crystallization by particle attachment in synthetic, biogenic, and geologic environments
The current understanding of CPA is described, some of the nonclassical thermodynamic and dynamic mechanisms known to give rise to experimentally observed pathways are examined, and the challenges to the understanding of these mechanisms are highlighted. Expand
Coordination chemistry of Ti(IV) in silicate glasses and melts: II. Glasses at ambient temperature and pressure
Abstract The coordination environment of Ti(IV) in a number of Ti-silicate and Ti-aluminosilicate glasses has been determined by x-ray absorption fine structure (XAFS) spectroscopy at the Ti K-edgeExpand
Nuclear Fuel in a Reactor Accident
The state of knowledge on the chemical and physical processes following the nuclear reactor accident is reviewed and how these results may inform decision-making during future events are considered, and priorities for research needed to develop future predictive models are discussed. Expand