Optical Absorption Spectra of (Ni, Mg)2SiO4 and (Co, Mg)2SiO4 Synthetic Olivines
نویسندگان
چکیده
منابع مشابه
Elasticity of Mg2SiO4 ringwoodite at mantle conditions
The themoelastic properties of Mg2SiO4 ringwoodite at mantle pressure and temperature conditions are reported based on ab nitio molecular dynamic simulations. A third-order Birch–Murnaghan equation at a reference temperature of 2000 K is defined by 0 = 138 GPa, K′ 0 = 5.2, and V0(2000 K) = 560.3 Å3. The Grűneisen parameter is determined to be γ(V) = γ0(V/V0(298 K))q with 3 δT 0 = 1.22 and q= 1....
متن کاملShock temperature measurements in Mg2SiO4 and SiO2 at high pressures
Temperatures in the high pressure shock state have been determined by measurement of optical radiation from pure samples of forsteritc (Mg2 SiOn), a-quartz, and fused silica. Shock waves of known amplitude were produced by tantalum flyer impact using a two-stage light gas gun. Shock pressures in the ranges 150-175 GPa and 70-115 GPa for Mg: SiOn and SiO2 respectively were achieved, and temperat...
متن کاملFirst principles investigation of the postspinel transition in Mg2SiO4
[1] We have investigated the dissociation of iron free ringwoodite, Mg2SiO4 g-spinel, into MgO periclase and MgSiO3 perovskite using quasi-harmonic free energy computations within the local density approximation (LDA) and generalized gradient approximation (GGA). The transition pressure, Ptr , obtained from GGA is higher and in much better agreement with experimental measurements than its LDA c...
متن کاملα–β–γ transformations in Mg2SiO4 in Earth's transition zone
Article history: Phase relations in α–β–γ M Received 31 October 2007 Received in revised form 3 June 2008 Accepted 11 June 2008 Available online 26 June 2008 Editor: R.D. van der Hilst
متن کاملPressure and strain dependence of the strength of sintered polycrystalline Mg2SiO4 ringwoodite
[1] Differential stresses in a cylindrical rock of polycrystalline Mg2SiO4 ringwoodite were measured at room temperature with pressures up to 10 GPa, axial strains in excess of 20%, and strain rates between 5 10 5 and 4 10 6 s , using the deformation-DIA coupled with monochromatic X-rays. The sample exhibited ductile behavior in axial shortening-lengthening cycles with reproducible hysteresis l...
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ژورنال
عنوان ژورنال: Journal of the Mineralogical Society of Japan
سال: 1984
ISSN: 1883-7018,0454-1146
DOI: 10.2465/gkk1952.16.365