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"Cs-tetra-ferri-annite:" High-pressure and high-temperature behavior of a potential nuclear waste disposal phase
High pressure High temperature geometric
2012/3/30
Structuredeformationsinducedbypressureandtemperatureinsynthetic!fi!fiCs-tetra-ferr2 3 3annite!fl!fl1M[
(Fe Fe )(Si Fe Al )O (OH) ],spacegroup C2/m, werean-1.78 6.15 0.05 20 45.93 0.07 1.80
alyzedtoi...
Effects of temperature and composition on the bulk modulus of (Mg,Fe)O
bulk modulus MgO FeO
2012/3/30
IsothermalstaticcompressiondataforMgOat300and1100Kwereobtainedbycom-
biningsynchrotronX-raydiffractiontechniqueswithanexternallyheatedhigh-temperature
diamond-anvilcellthatiscapableofachievingpressu...
High temperature in situ structural investigation on lead feldspar
High-temperature increase
2012/3/30
Single-crystalX-raydiffractionwasperformedinsituat T 20,230,465,and700C
Si O , I2/c,a 8.402, b 13.043, c 14.308
onapartiallyorderedleadfeldspar(PbAl2 2 8351??
A, 115.30, V 1417.6A ; Q 0.71).Theunit...
Low-Temperature Alteration in Tuffs from Yucca Mountain, Nevada
Alteration Clays Coatings Glass Silica Smectite Tuff Weathering Yucca Mountain Zeolites
2011/12/2
Abstract: The structure, chemistry and distribution of hydrothermal alteration and weathering products of feldspars and glass in 3 samples of Yucca Mountain tuffs (GSW G4 borehole at a depth of 1531 f...
The temperature dependence of the cation distribution in synthetic hercynite (FeAl2O4) from the in-situ neutron structure refinements
temperature dependence cation distribution synthetic hercynite (FeAl2O4) in-situ neutron structure refinements
2012/4/1
The temperature dependence of the cation distribution in synthetic hercynite (FeAl2O4) has been determined using in-situ time-of-flight neutron powder diffraction. The sample was synthesized from the ...
Volume measurements of zoisite at simultaneously elevated pressure and temperature
Volume measurements zoisite pressure temperature
2012/4/1
Unit-cell parameters of zoisite, Ca2Al3Si3O12(OH), have been measured at simultaneously high pressures and temperatures (up to 6.1 GPa and 8008 C) in a Walker-style multi-anvil apparatus at the synchr...
Structure and dynamics of magnesium in silicate melts: A high-temperature 25Mg NMR study
Structure dynamics magnesium silicate melts high-temperature
2012/4/1
25Mg NMR spectra for several silicate and aluminosilicate melts were obtained from 1000–1470 8C. The peaks are initially very broad, but narrow with increasing temperature to near 500 Hz at the highes...
Characterization of the high-temperature modifications of incommensurate tridymite L3-To(MX-1) from 25 to 250∑C
Characterization high-temperature modifications incommensurate tridymite L3-To(MX-1)
2012/4/1
Incommensurate tridymite L3-TO(MX-1) shows a cascade of five phase transitions at 65,110, 150, 200, and 380 8C upon heating. The X-ray diffraction patterns were investigated with a Buerger precession ...
Fe-Mg order-disorder in tremolite-actinolite-ferro-actinolite at ambient and high temperature
Fe-Mg order-disorder tremolite-actinolite-ferro-actinolite temperature
2012/3/31
The crystal structures and M-site populations of a series of unheated and heat-treated,near-binary members of the actinolite series were determined from single-crystal X-ray diffraction data. Small, s...
Sound velocities of polycrystalline MgSiO3 -orthopyroxene to 10 GPa at room temperature
Sound velocities polycrystalline MgSiO3 -orthopyroxene temperature
2012/3/31
A polycrystalline sample of MgSiO3-orthopyroxene was hot pressed at a pressure of 4 GPa and temperature of 975 8 C in a multi-anvil apparatus. The recovered specimen has a bulk density within 1% of th...
High-temperature multi-nuclear NMR investigation of analcime
High-temperature multi-nuclear NMR investigation analcime
2012/3/31
Two analcimes of hydrothermal and diagenetic origin were investigated by in situ29Si,27Al, and 23 Na NMR from room temperature to 550 8 C, and by TGA and DSC. The two samples dehydrate at different te...
Temperature dependence of the OH- absorption in the SiO2 glass and melt to 1975 K
Temperature dependence OH- absorption SiO2 glass
2012/3/31
FTIR absorbance spectra of SiO2 glass containing 1200 ppm OH2 groups were recorded in situ to 1975 K. There are only minor changes in peak height to 1700 K, indicating that the molar extinction coeffi...
Reactions of aqueous Au1+ sulfide species with pyrite as a function of pH and temperature
Reactions of aqueous Au1+ sulfide species with pyrite as a function of pH and temperature
2012/3/31
The reactivity of aqueous Au11 sulfides with FeS2 at pH 5 3 and 6 for temperatures of 25 and 908C has been investigated using X-ray photoelectron spectroscopy (XPS), scan-ning electron microscopy with...
An experimental study of the pressure-temperature stability of MgMgAl-pumpellyite in the system MgO-Al2O3-SiO2-H2O
An experimental study of the pressure-temperature stability of MgMgAl-pumpellyite in the system MgO-Al2O3-SiO2-H2O
2012/3/31
The stability field of MgMgAl-pumpellyite, Mg5Al5SiO21(OH)7, was determined in the system MgO-Al2O3-SiO2-H2O in reversal experiments at pressures between 34 and 100 kbar and temperatures in the range ...
Equation of state of brucite: Single-crystal Brillouin spectroscopy study and polycrystalline pressure-volume-temperature measurement
Single-crystal Brillouin spectroscopy polycrystalline pressure-volume-temperature measurement
2012/3/30
Acoustic velocities of brucite were measured at room pressure in over 48 directions from Brillouin spectroscopy using a natural sample. These data are supplemented with volume measurements as a functi...