Michael H. G. Jacobs, Rainer Schmid-Fetzer, Arie P. van den Berg
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Thermophysical properties and phase diagrams in the system MgO–SiO2–FeO at lower mantle conditions derived from a multiple-Einstein method
In a previous paper we showed that the multiple Einstein method is suitable to determine consistency of data on thermophysical properties and phase diagrams in the system MgO–FeO–SiO2 for upper mantle and transition zone conditions in the Earth. Here we extend this work to conditions covering the lower mantle, in the temperature range between 0 and 3000 K and pressure range between 20 and 140 GPa, with the goal to determine which data are consistent with each other. The resulting database is used to study the effect of the spin transition in ferropericlase on thermophysical properties and phase diagrams. Although trade-off is present in the model parameters due to the lack of experimental data, we show that models, reduced in complexity, can be used to study the effect of Fe3+ on these properties and phase equilibria. We show that the effect of the miscibility gap in ferropericlase, its spin transition and the valence state of Fe does not have a significant visibility in seismic density and velocities isentropes. We demonstrate that the overall composition derived by Chust et al. (J Geophys Res Solid Earth 122:9881–9920, 2018) is suitable to represent PREM and AK135 seismic data to within experimental uncertainty.
期刊介绍:
Physics and Chemistry of Minerals is an international journal devoted to publishing articles and short communications of physical or chemical studies on minerals or solids related to minerals. The aim of the journal is to support competent interdisciplinary work in mineralogy and physics or chemistry. Particular emphasis is placed on applications of modern techniques or new theories and models to interpret atomic structures and physical or chemical properties of minerals. Some subjects of interest are:
-Relationships between atomic structure and crystalline state (structures of various states, crystal energies, crystal growth, thermodynamic studies, phase transformations, solid solution, exsolution phenomena, etc.)
-General solid state spectroscopy (ultraviolet, visible, infrared, Raman, ESCA, luminescence, X-ray, electron paramagnetic resonance, nuclear magnetic resonance, gamma ray resonance, etc.)
-Experimental and theoretical analysis of chemical bonding in minerals (application of crystal field, molecular orbital, band theories, etc.)
-Physical properties (magnetic, mechanical, electric, optical, thermodynamic, etc.)
-Relations between thermal expansion, compressibility, elastic constants, and fundamental properties of atomic structure, particularly as applied to geophysical problems
-Electron microscopy in support of physical and chemical studies
-Computational methods in the study of the structure and properties of minerals
-Mineral surfaces (experimental methods, structure and properties)