搜索结果: 1-15 共查到“矿床学与矿相学 temperatures”相关记录17条 . 查询时间(0.162 秒)
Local Ca-Mg distribution of Mg-rich pyrope-grossular garnets synthesized at different temperatures revealed by 29Si MAS NMR spectroscopy
Local Ca-Mg distribution Mg-rich pyrope-grossular garnets synthesized different temperatures revealed 29Si MAS NMR spectroscopy
2012/4/1
Pyrope-grossular solid solutions, (Mg,Ca) Al Si O , of composition Py Gr and Py Gr were3 2 3 12 85 15 75 25
synthesized at 1000, 1200, and 1400 ?C and 30 kbars in a piston-cylinder device. The synt...
Energy barriers to viscous flow and the prediction of glass transition temperatures of molten silicates
Energy barriers viscous flow glass transition temperatures molten silicates
2012/3/31
Within the framework of the Adam-Gibbs (configurational entropy) theory of viscosity,it is shown that for a given composition, the ratio of parameters Be
(a temperature inde-pendent constant) to Sc( ...
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...
Mutual exsolution in hornblende and cummingtonite: Compositions, lamellar orientations, and exsolution temperatures
Mutual exsolution hornblende cummingtonite Compositions lamellar orientations exsolution temperatures
2012/4/6
Exsolvedpairsofhornblende and cummingtonite from two localities in southern New England, U.S.A.,have been studied using transmission electron microscopy(TEM) to measurethe crystallographic orientation...
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
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...
The phenomenon of low Al-Si ordering temperatures in aluminosilicate framework structures
phenomenon Al-Si ordering temperatures aluminosilicate framework structures
2012/4/5
The enthalpy ofordering ofAland Sibetween tetrahedral sites in framework structures is now known from several studies to bein the range 0.3-1.4 eVper two Al-O-Si linkages, depending on the structure a...
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...
Development of Ammonium-Saponites from Gels with Variable Ammonium Concentration and Water Content at Low Temperatures
Cation exchange capacity Infrared spectroscopy Saponite Synthesis Thermal analysis Transmission electron microscopy X-ray powder diffraction
2011/12/1
Abstract: Ammonium-saponite is hydrothermally grown at temperatures below 300°C from a gel with an overall composition corresponding to (NH4)0.6Mg3Si3.4Al0.6O10(OH)2. The synthetic saponite and co-exi...
Comparison of I/S Transformation and Maturity of Organic Matter at Elevated Temperatures
Illite/smectite Kinetics Vitrinite maturity
2011/12/29
Comparing the state of reaction advancement of I/S (illite content of illite/smectite mixed layer minerals) and organic matter (vitrinite reflectance) in instances of high temperature gradients allows...
The Influence of Aluminum on Iron Oxides: XIV. Al-Substituted Magnetite Synthesized at Ambient Temperatures
Aluminum Goethite Iron oxide Magnetite Mossbauer spectroscopy X-ray powder diffraction
2012/1/4
Mixtures of magnetite and goethite were formed by the slow oxidation of mixed FeCl2-AlCl3 solutions in an alkaline environment at room temperature. The compositions of the products ranged from almost ...
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...
Syntheses of Glauconite at Surface Temperatures
Glauconite Diagenesis Pore solutions Synthesis
2012/2/9
Glauconite has been synthesized at low temperature by precipitation of Fe-hydroxides from Si-, Fe-, Al-, and K-containing solutions under reducing conditions. The compositions favorable for the synthe...
Behavior of Kaolinite Pellets at Elevated Temperatures
Dehydration Dehydroxylation Dilatometry Kaolinite Mullite Spinel
2011/11/18
Abstract: Dimensional changes in kaolinite pellets as a function of temperature show two sharp shrinkage “steps,” at about 450–550°C and 900–980°C, which are roughly comparable in magnitude. Isotherma...