搜索结果: 1-13 共查到“矿床学与矿相学 pressures”相关记录13条 . 查询时间(0.156 秒)
57Fe nuclear forward scattering of synchrotron radiation in hedenbergite CaFeSi2O6 at hydrostatic pressures up to 68 GPa
nuclear forward scattering CaFeSi2O6 hydrostatic pressures 68 GPa
2012/3/31
The Fenuclearforwardscattering(NFS)ofsynchrotronradiationandtheuseofdia-
mondanvilswithheliumaspressuremediumallowedstudyoftheelectronicstateofFe
inthechainsilicatehedenbergiteCaFeSi O atpressuresup...
Normal and inverse ringwoodite at high pressures
Fe synchrotron X-ray low temperatures high pressures
2012/3/30
SynchrotronanomalousscatteringexperimentswithX-raywavelengthsattheFe K ab-
sorptionedgehavemadeitpossibletodistinguishbetweenionshavingdifferentvalence
statesinmagnetiteatlowtemperatures.Usingalarge...
Molecular dynamics simulations of phase transitions and melting in perovskite MgSiO3 at mantle pressures
Molecular dynamics simulations phase transitions MgSiO3
2012/4/1
The high pressure phase transitions and melting of the mantle mineral MgSiO3 with the perovskite structure were investigated using molecular dynamics (MD) simulations of a large system of atoms on a p...
Examination of X-ray diffraction intensities for FeO collected in situ at high pressure and high temperature reveals that the atomic arrangements of FeO in the hexagonal struc-ture are not the same as...
Complete Fe-Mg solid solution in lithium niobate and perovskite structures in titanates at high pressures and temperatures
Complete Fe-Mg solid solution lithium niobate perovskite structures titanates high pressures temperatures
2012/4/5
Anewhigh-pressureMgTiO phasewiththelithiumniobatestructure(R3c)hasbeen
roveredfromexperimentsat21GPaand1200C.Phaseswiththelithiumniobate
structurewerealsosynthesizedforintermediatecompositionsbetwee...
Elastic properties of orthorhombic MgSiO3 perovskite at lower mantle pressures
Elastic properties orthorhombic MgSiO3 perovskite lower mantle pressures
2012/4/5
ThefullelasticconstanttensoroforthorhombicMgSiO perovskitehasbeendetermined
from?rstprinciplesforthe?rsttimeathighpressureusingtheplane-wavepseudopotential
method.Theathermalelasticmoduli,determined...
Montmorillonite under high H2O pressures: Stability of hydrate phases, rehydration hysteresis, and the effect of interlayer cations
Montmorillonite high H2O pressures Stability hydrate phases rehydration hysteresis effect interlayer cations
2012/4/1
Dehydration of Ca- and Mg-exchanged montmorillonite was studied along H20 iso-
chores in the hydrothermal diamond-anvil cell by in situ X-ray diffraction using a syn-
chrotron radiation source. At-r...
Phase changes and amorphization of zeolites at high pressures: The case of scolecite and mesolite
Phase changes amorphization of zeolites high pressures scolecite mesolite
2012/4/6
Pressure-induced amorphous-phase transitions (amorphization) have been observed in framework silicates like quartz and feldspars. Asimilar crystalline to highly disordered solid phase transition is re...
An in situ Raman spectroscopic study of Na2Si2O5 at high pressures and temperatures: Structures of compressed liquids and glasses
situ Raman spectroscopic study Na2Si2O5 high pressures temperatures Structures glasses
2012/4/5
Raman spectra ofNa2Si20sglassand Na2Si20sliquid have been collected in situ to pressuresof16GPaat300Kand 10GPaat885K.Inglasscompressed at300K,bands
associated withintertetrahedral bridging 0 atoms de...
Formation of Smectite Crystals at High Pressures and Temperatures
High pressure High temperature Smectite Synthesis
2011/12/29
Smectite single crystals of superior quality were synthesized at high pressures and temperatures using a modified belt type high pressure apparatus. Pressure-temperature conditions were established fo...
Bond Energy of Adsorbed and Interlayer Water: Kerolite Dehydration at Elevated Pressures
Bond energy Dehydration High-pressure differential thermal analysis Kerolite Water
2011/12/31
The dehydration reaction of kerolite was investigated using high-pressure differential thermal analysis at pressures as high as 600 bars. The peak associated with the dehydration is broad, suggesting ...
Hydration States of Smectite in NaCl Brines at Elevated Pressures and Temperatures
Brine Diagenesis Hydration Pressure Smectite Temperature
2012/1/12
A high-pressure, high-temperature cell was used to monitor the basal X-ray powder diffraction spacing of Na-saturated Cheto montmorillonite in contact with NaCl solutions at temperatures as high as 20...
Dehydration of K-Exchanged Montmorillonite at Elevated Temperatures and Pressures
Dehydration Differential thermal analysis Enthalpy Montmorillonite Potassium Pressure
2012/1/12
The dehydration temperature of K-montmorillonite, obtained by ion exchange of a Na-montmorillonite, was determined at pressures to 2 kbar, using high-pressure differential thermal analysis. Dehydratio...