منابع مشابه
Melting Behaviour of Model Lherzolite in the System CaO–MgO–Al2O3–SiO2–FeO at 0·7–2·8 GPa
Fe–Mg exchange is the most important solid solution involved in for Fe–Mg exchange between the coexisting crystalline phases and melt, KdFe–Mg, show a relatively simple and predictable behaviour partial melting of spinel lherzolite, and the system CaO– MgO–Al2O3–SiO2–FeO (CMASF) is ideally suited to explore with pressure and temperature: the coefficients for olivine and spinel do not show signi...
متن کاملBacterial ferrous iron transport: the Feo system.
To maintain iron homeostasis within the cell, bacteria have evolved various types of iron acquisition systems. Ferric iron (Fe(3+)) is the dominant species in an oxygenated environment, while ferrous iron (Fe(2+)) is more abundant under anaerobic conditions or at low pH. For organisms that must combat oxygen limitation for their everyday survival, pathways for the uptake of ferrous iron are ess...
متن کاملDensity Functional Study of FeO 2 , FeO + 2 , and FeO − 2 ALFONSO T . GARCÍA - SOSA , MIGUEL CASTRO
The lowest energy structures of FeO2 were determined by means of density functional theory techniques as implemented in the program DGauss 3.0.1. The calculations performed were of the all-electron type using two levels of theory, namely the local spin density approximation with the use of the Vosko–Wilk–Nusair (VWN) functional and the generalized gradient approximation (GGA) in the form of the...
متن کاملPostperovskite phase equilibria in the MgSiO3-Al2O3 system.
We investigate high-P,T phase equilibria of the MgSiO(3)-Al(2)O(3) system by means of the density functional ab initio computation methods with multiconfiguration sampling. Being different from earlier studies based on the static substitution properties with no consideration of Rh(2)O(3)(II) phase, present calculations demonstrate that (i) dissolving Al(2)O(3) tends to decrease the postperovski...
متن کاملTEM and XRD investigation of Fe2O3-Al2O3 system
Ovidius University of Constanta, Department of Physics, 124 Mamaia Blvd, 900527, Romania ___________________________________________________________________________________________ Abstract. A series of Fe2O3-Al2O3 mixed systems with composition ranging from 1 to 9% of Al2O3 were prepared by a traditional chemical method and examined for structural characteristics. XRD spectra and SAED patterns...
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ژورنال
عنوان ژورنال: The Journal of the Japanese Association of Mineralogists, Petrologists and Economic Geologists
سال: 1953
ISSN: 0021-4825,1883-0765
DOI: 10.2465/ganko1941.37.193