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The Fenuclearforwardscattering(NFS)ofsynchrotronradiationandtheuseofdia- mondanvilswithheliumaspressuremediumallowedstudyoftheelectronicstateofFe inthechainsilicatehedenbergiteCaFeSi O atpressuresup...
SynchrotronanomalousscatteringexperimentswithX-raywavelengthsattheFe K ab- sorptionedgehavemadeitpossibletodistinguishbetweenionshavingdifferentvalence statesinmagnetiteatlowtemperatures.Usingalarge...
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...
Anewhigh-pressureMgTiO phasewiththelithiumniobatestructure(R3c)hasbeen roveredfromexperimentsat21GPaand1200C.Phaseswiththelithiumniobate structurewerealsosynthesizedforintermediatecompositionsbetwee...
ThefullelasticconstanttensoroforthorhombicMgSiO perovskitehasbeendetermined from?rstprinciplesforthe?rsttimeathighpressureusingtheplane-wavepseudopotential method.Theathermalelasticmoduli,determined...
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...
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...
Raman spectra ofNa2Si20sglassand Na2Si20sliquid have been collected in situ to pressuresof16GPaat300Kand 10GPaat885K.Inglasscompressed at300K,bands associated withintertetrahedral bridging 0 atoms de...
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...
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 ...
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...
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...

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