搜索结果: 1-10 共查到“矿床学与矿相学 Spinel”相关记录10条 . 查询时间(0.06 秒)
Diogenites as asteroidal cumulates: Insights from spinel chemistry
asteroidal cumulates spinel chemistry orthopyroxene
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2012/3/31
The chemical composition of spinel was determined for a suite of 19 diogenites (orthopyroxenites)
thought to be from asteroid 4 Vesta. Previous studies (Fowler et al. 1994, 1995) of orthopyroxene
de...
In situ neutron diffraction study of non-convergent cation ordering in the (Fe3O4)1-x(MgAl2O4)x spinel solid solution
non-convergent cation ordering (Fe3O4)1-x(MgAl2O4)x spinel solid solution
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2012/3/31
Non-convergent cation ordering in the (Fe O ) (MgAl O ) solid solution was investigated us-
ing in-situ time-of-flight neutron powder diffraction. The approach to equilibrium in a sample with
x = 0...
Thermodynamics and kinetics of cation ordering in MgAl2O4 spinel up to 1600 °C from in situ neutron diffraction
MgAl2O4 temperature to 1600C situ neutron diffraction
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2012/3/30
Thetemperaturedependenceofthecationdistributioninsyntheticspinel(MgAl O )was2 4
determinedusingin-situtime-of-?ightneutronpowderdiffraction.Neutrondiffractionpat-
ternsofstoichiometricMgAl
O andsli...
The systematics of Cr3+ and Cr2+ partitioning between olivine and liquid in the presence of spinel
Cr3+ Cr2+ spinel
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2012/3/31
The partitioning behavior of Cr into olivine in basaltic systems has been parameterized and can now be modeled over a wide range of redox conditions and liquid compositions.The Cr21/Cr31 in spinel-sat...
Formation of Spinel from a Hydrotalcite-Like Compound at Low Temperature: Reaction between Edges of Crystallites
Double Hydroxide Grinding Hydrotalcite Reconstruction Spinel Thermal Decomposition
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2011/12/23
Abstract: The thermal decomposition behavior of hydrotalcite-like compounds (HTlcs) prepared by reconstruction of calcined HTlcs is described. From the results of X-ray diffraction (XRD), it seems tha...
Cation mixing in natural MgAl2O4 spinel: A high-temperature 27Al NMR study
Cation mixing MgAl2O4 spinel high-temperature 27Al NMR study
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2012/4/6
ThepositionaldisorderofMg andAl cationsbetweenthetetrahedralandoctahedralsitesinnaturalMgAlO spinelhasbeeninvestigatedby AlMASNMRatroomtem-2 427peratureandin-situhigh-temperatureAlNMRspectroscopyupto1...
Interaction between exsolution microstructures and magnetic properties of the magnetite-spinel solid solution
Interaction exsolution microstructures magnetic properties magnetite-spinel solid solution
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2012/4/1
Magnetic properties of exsolved samples of the (Fe304t(MgAlz04),_x solid solution weremeasured over the temperature range 4-923 K and were correlated with microstructuresobserved by transmission elect...
Direct oxygen measurements of Cr-rich spinel: Implications for spinel stoichiometry
Direct oxygen measurements Cr-rich spinel Implications spinel stoichiometry
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2012/4/6
Theavailability ofa synthetic multilayercrystal and accurately calibrated oxide and silicate standards makeit possible to usethe electron microprobefor precisea analysis ofspinel. Arequirement ofthe a...
Magnetic properties of the magnetite-spinel solid solution: Curie temperatures, magnetic susceptibilities, and cation ordering
Magnetic properties magnetite-spinel solid solution Curie temperatures magnetic susceptibilities cation ordering
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2012/4/5
Curietemperatures (Td ofthe (Fe304)x(MgA1204)1-xsolid solution have been deter-minedfrom measurementsofmagneticsusceptibility (x)vs.temperature. Thetrend in Te
vs.composition extrapolates to 0Katx =0...
Influence of Fe(II) on the Formation of the Spinel Iron Oxide in Alkaline Medium
Dissolution Ferrihydrite Maghemite Magnetite Mossbauer spectroscopy
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2011/12/31
Fe(II) and Fe(III) in various proportions were coprecipitated by NH3 at pH ≈ 11. The Fe(II)/Fe(III) ratio (x) was varied from 0.10 to 0.50. After stabilization by aging at pH ≃ 8 in anaerobic co...