The System CaSiO3-CaF2.
نویسندگان
چکیده
منابع مشابه
PHASE EQUILIBRIA IN THE SYSTEM MgO-Mn2O3-MnO-CaSiO3 IN AIR
The Mg0-Mn203-Mn0 system in air exhibits two series of solid solutions, (Mg,Mn)Mn204 and (Mg,Mn)O, the boundaries of which have been located. At 1600 +5' C a tie-triangle exists in which these two solid solution phases and a liquid phase coexist with the gas phase. The Mn3+/Mn2+ ratio of the crystalline phases is lowered by the addition of CaSi03 and this has the effect of stabilising the (Mg,M...
متن کاملMelting phase relations in the MgSiO3–CaSiO3 system at 24 GPa
The Earth’s lower mantle is composed of bridgmanite, ferropericlase, and CaSiO3-rich perovskite. The melting phase relations between each component are key to understanding the melting of the Earth’s lower mantle and the crystallization of the deep magma ocean. In this study, melting phase relations in the MgSiO3–CaSiO3 system were investigated at 24 GPa using a multi-anvil apparatus. The eutec...
متن کاملOn the coloration properties of CaF2 : Na
2014 We have investigated the dichroic properties and the existence of metastable excited states of several colour centres created by X-irradiation in CaF2 : Na. According to our results absorption bands peaking at 600, 385 and 322 nm are associated to the same centre which behaves optically as orthorhombic. The lack of observation of a metastable state is in favour of the F+2A model for this c...
متن کاملCaSiO3 perovskite at lower mantle pressures
[1] We investigate by first-principles the structural behavior of CaSiO3 perovskite up to lower mantle pressures. We confirm that the cubic perovskite modification is unstable at all pressures. The zero Kelvin structure is stabilized by SiO6 octahedral rotations that lower the symmetry to tetragonal, orthorhombic, rhombohedral, or to a cubic supercell. The resulting structures have comparable e...
متن کاملTheoretical determination of the structures of CaSiO3 perovskites.
Density functional theory is used to determine the possible crystal structure of the CaSiO3 perovskites and their evolution under pressure. The ideal cubic perovskite is considered as a starting point for studying several possible lower-symmetry distorted structures. The theoretical lattice parameters and the atomic coordinates for all the structures are determined, and the results are discusse...
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ژورنال
عنوان ژورنال: Acta Chemica Scandinavica
سال: 1955
ISSN: 0904-213X
DOI: 10.3891/acta.chem.scand.09-1350