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Formation of Spinel from a Hydrotalcite-Like Compound at Low Temperature: Reaction between Edges of Crystallites
Double Hydroxide Grinding Hydrotalcite Reconstruction Spinel Thermal Decomposition
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
2012/4/6
ThepositionaldisorderofMg andAl cationsbetweenthetetrahedralandoctahedralsitesinnaturalMgAlO spinelhasbeeninvestigatedby AlMASNMRatroomtem-2 427peratureandin-situhigh-temperatureAlNMRspectroscopyupto1...
Analytical electron microscopy of nanometer-scale hornblende lamellae: Low-temperature exsolution in cummingtonite
Analytical electron microscopy nanometer-scale hornblende lamellae: Low-temperature cummingtonite
2012/4/6
Compositionalpro?lesacrosshostareasweremeasuredtohelpinterprettheunexpected
chemistriesofthenanometer-scalediscs.Apro?leacrosstheprecipitate-freezonebetween
acoarsehornblendelamellaandagroupofnanome...
Marcasite oxidation in low-temperature acidic (pH 3.0) solutions: Mechanism and rate laws
Marcasite oxidation low-temperature acidic :Mechanism rate laws
2012/4/6
MarcasitesurfaceswereanalyzedusingX-rayphotoelectronspectroscopy(XPS)andaugerelectronspectroscop(AES).XPSdataofapristinemarcasitesurfaceareusedasatemplatetoexaminethecharacteristicsofamarcasitesurface...
Third-generation synchrotron x-ray diffraction of 6-mm crystal of raite, 'Na3Mn3Ti0.25Si8O20(OH)2z10H2O, opens up new chemistry and physics of low-temperature minerals
Third-generation synchrotron x-ray diffraction low-temperature minerals chemistry and physics
2011/11/11
The crystal structure of raite was solved and refined from data collected at Beamline Insertion Device 13 at the European Synchrotron Radiation Facility, using a 3 3 3 3 65 mm single crystal. The refi...
K in clinopyroxene at high pressure and temperature: An experimental study
K clinopyroxene high pressure temperature experimental study
2012/4/5
Clinopyroxene(Cpx)isaprincipalupper-mantlephaseforconcentratinglargecationsbuthasnotbeenviewedasamajorcrystal-chemicalreservoirforKbecauseKisconsideredoolargetoenterthelargestsite,M2,inthepyroxenestru...
Volumes of K-Na mixing for low albite-microcline crystalline solutions at elevated temperature: A test of regular solution thermodynamic models
K-Na mixing low albite-microcline crystalline solutions elevated temperature test regular solution thermodynamic models
2012/4/1
High-temperature volumes of K-Na mixing have been investigated for a seven-member
low albite-microcline ion-exchange series by conducting X-ray powder diffraction mea-
surements from room temperatur...
Memory effects of domain structures during displacive phase transitions: A high-temperature TEM study of quartz and anorthite
Memory effects domain structures displacive phase transitions high-temperature TEM study of quartz anorthite
2012/4/1
Memory effects ass~iated with the Dauphine twins in a quartz and the c-antiphase
domains (c-APDs) in PI anorthite have been investigated by in situ hot-stage transmission
electron microscopy (TEM). ...
Effect of Time and Temperature on the Chemical Composition and Crystallization of Mixed Iron and Aluminum Species
Aluminum Crystallization Gibbsite Iron
2011/12/1
Abstract: We studied the influence of time ageing (up to 120 d at 50°C or 30d at 95°C) on the mineralogical and chemical composition of hydrolytic species of mixed aluminum and iron samples formed at ...
A new type of high-temperature, high-pressure cell for spectroscopic studies of hydrous silicate melts
high-temperature high-pressure cell spectroscopic studies hydrous silicate melts
2012/4/9
Anovel type ofhigh-temperature, high-pressure cell has been designed for near-infrared and optical spectroscopy of hydrous silicate meltsat pressures up to 3 kbar and temper-atures up to 800 0c. It co...
Pressure-temperature-reaction history of metapelitic rocks from the Maryland Piedmont on the basis of correlated garnet zoning and plagioclase-inclusion composition
Pressure-temperature-reaction history metapelitic rocks Maryland Piedmont garnet zoning plagioclase-inclusion composition
2012/4/9
Regional structural interpretation, thermobarometry, and Gibbs-method calculations werecombined to determine an approximate P-Tpath for kyanite-grade metapelitic rocks ofthe Baltimore Gneiss terrane. ...
Displacive phase transition in anorthoclase: The "plateau effect" and the effect of T1-T2 ordering on the transition temperature
Displacive phase transition anorthoclase plateau effect T1-T2 transition temperature
2012/4/9
The effects of compositional changes and nonsymmetry-breaking AI-Siordering onthe displacive phase transition in anorthoclase have been studied using X-ray powder diffrac-tion. The results wereanalyze...
Magnesium site exchange in forsterite: A direct measurement by high-temperature 25Mg NMR spectroscopy
Magnesium site forsterite measurement high-temperature 25Mg NMR spectroscopy
2012/4/9
High-resolution 25MgNMR data are reported for a single crystal of pure forsterite (Mg2Si04) at temperatures to about 1400°C, which allow rates of exchange ofMgcations among specific sites in the struc...
Hydrogen positions and thermal expansion in lizardite-1T from Elba: A low-temperature study using Rietveld refinement of neutron diffraction data
Hydrogen positions thermal expansion lizardite-1T Elba low-temperature study neutron diffraction data
2012/4/6
Thestructure oflizardite-l Tfrom MonteFico,Elba,wasrefined in spacegroupP31m usingneutron diffractiondata, measuredat 8, 150,and 294K,and full-profile Rietveld
refinement techniques. Thelattice param...
High-pressure, high-temperature Raman spectroscopic study of ilmenite-type MgSiO3
High-pressure high-temperature Raman spectroscopic study ilmenite-type MgSiO3
2012/4/6
High-pressure and high-temperature Raman spectra ofilmenite-type MgSi03have been collected up to 7 GPa and 1030 K,respectively. The observed Raman frequency shifts withpressure and temperature wereuse...