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Enthalpy of formation of katoite Ca3Al2[(OH)4]3: Energetics of the hydrogarnet substitution
hydrogarnet substitution Ca3Al2[(OH)4]3 energetic
2012/3/31
Thesilicon-freeendmemberofthehydrogrossularsolidsolutionseries,katoite
Al [(OH) ] ,wassynthesizedinasolid-media,piston-cylinderapparatus.TheenthalpyCa
offormationfromthecomponentoxideswasmeasuredbyh...
Effect of isovalent Si, Ti substitution on the bulk moduli of Ca(Ti1-xSix) SiO5 titanites
Si Ti bulk modulus
2012/3/30
Theequationsofstateof A2/a titanitephasesofCaTiSiO ,Ca(Ti Si )SiO ,andCaSi O5 0.5 0.5 5 2 5
havebeendeterminedfromhigh-pressureX-raydiffractionmeasurements.Theisothermal
bulkmoduliare K 131.4(7)GPa(...
The influence of iron substitution on the magnetic properties of hausmannite, Mn2+(Fe,Mn)3+2O4
iron substitution magnetic properties hausmannite Mn2+(Fe,Mn)3+2O4
2012/3/31
The occurrence of hausmannite with an apparent Curie temperature close to 750 K, instead of 41.8 K was recently described from hydrothermally altered manganese ore from the Kalahari manganese field, S...
Gallium and Chromium Substitution for Aluminum in Synthesized Beidellite
Beidellite Synthesis Chromium Gallium Isomorphous Substitution
2011/12/8
Abstract: The hydrothermal synthesis of Mg-beidellite in which limited amounts of Ga and Cr are clearly shown to be incorporated into nonexchangeable positions in the clay layer framework is reported ...
Effects of Mg-Fe2+ substitution in calcite-structure carbonates: Thermoelastic properties
Mg-Fe2+ substitution calcite-structure carbonates Thermoelastic properties
2012/3/31
In situ X-ray diffraction has been carried out on two siderite samples of different Fe contents simultaneously at high pressure and high temperature in a DIA-type, large-volume apparatus. Unit-cell vo...
Mechanism of the SiO4 for CO3 substitution in defernite, Ca6(CO3)1.58(Si2O7)0.21(OH)7
Mechanism SiO4 CO3 substitution defernite Ca6(CO3)1.58(Si2O7)0.21(OH)7
2012/4/6
Defernite, Ca6(C03)L5s(Si207)o.21(OHMClo.5o(OH)o.os(H20)od, is a carbonate mineral [space group Pnam; at 100K:a= 17.744(2), b=22.601(4), c =3.633(1) A,Z=4]withzeolite-like structural channels. The str...
Mechanism of CO32- substitution in carbonate-fluorapatite: Evidence from FTIR spectroscopy, 13C NMR, and quantum mechanical calculations---Reply to Nathan
Mechanism CO32- substitution carbonate-fluorapatite Evidence FTIR spectroscopy 13C NMR quantum mechanical calculations---Reply Nathan
2012/4/5
In the critical comment byNathan (1996), the author essentially claims that the samples used in our study (Regnier et al. 1994) werenot very appropriate to dem-onstrate the absence of C03P-. Furthermo...
Mechanism of CO32- substitution in carbonate-fluorapatite: Evidence from FTIR spectroscopy, 13C NMR, and quantum mechanical calculations---Discussion
Mechanism CO32- substitution carbonate-fluorapatite Evidence FTIR spectroscopy 13C NMR quantum mechanical calculations---Discussion
2012/4/5
The carbonate substitution in apatite continues to pro-voke controversies. In a recent paper, Regnier etal. (1994) challenged the existence of the hypothetical C03P- ion in carbonate-fluorapatite (fra...
Iron Substitution in Soil and Synthetic Anatase
Anatase Crystal chemistry EPR Fe substitution FTIR Mossbauer OH桹-substitution Pseudobrookite TA TEM XRD
2011/12/28
IronIII for TiIV substitution in the structure of pedogenic and synthetic anatase of up to Fe/(Ti+Fe) 0.1 mol/mol was indicated by an increase in unit cell size as measured by XRD line shifts. M鰏sbaue...
Clay Minerals in the MacAdams Sandstone, California: Implications for Substitution of H3O+ and H2O and Metastability of Illite
Electron microscopy Hydronium Illite Kaolinite Muscovite Rectorite
2011/12/1
Abstract: Clay minerals from the MacAdams Sandstone, Kettleman North Dome, California, have been studied by electron microscopy. The clay minerals fill pore space associated with fractured and breccia...
The Influence of Aluminum on Iron Oxides. Part XVI: Hydroxyl and Aluminum Substitution in Synthetic Hematites
Al substitution Cell-edge lengths Hematite LOI OH substitution X-ray intensity
2011/12/31
Synthetic hematites with Al substitutions between 0 and 18 mol % were synthesized at different temperatures and water activities. The cell-edge lengths a for different synthesis conditions decreased l...
Ammonium Substitution in Illite During Maturation of Organic Matter
Ammonium substitution ?Fixed-ammonium ?Hydrocarbon generation ?Illite/smectite transformation ?Organic maturation
2012/1/4
Pierre shale samples from a thin stratigraphic zone within the contact aureole of the lamprophyric Walsen dike record changes due to thermal effects that are not influenced by detrital differences. An...
Fe Substitution for Al in Glauconite with Increasing Diagenesis in the First Wilcox Sandstone (Lower Eocene), Livingston Parish, Louisiana
Ankerite cement Diagenesis Glauconite Illite/smectite Iron Potassium
2011/11/30
Abstract: Glauconites in early ankerite concretions, ferroan calcite-cemented sandstones, and uncemented sandstones in the first Wilcox sandstone of the Lockhart Crossing field, Livingston Parish, Lou...
The Nature of Cation-Substitution Sites in Phyllosilicates
Beidellite Cation-substitution site Electrostatic potential Hectorite Montmorillonite Vermiculite
2012/1/5
A fundamental property of electrostatic potentials is their additivity. This study demonstrates that the electrostatic potential of a negatively charged, cation-substituted phyllosilicate layer can be...
The Influence of Aluminum on Iron Oxides. XV. Al-for-Fe Substitution in Synthetic Lepidocrocite
Aluminum Infrared spectroscopy Iron Lepidocrocite X-ray powder diffraction
2012/1/4
Lepidocrocite samples, γ-FeOOH, containing 0–10 mole % Al-for-Fe substitution were synthesized at 15°C and pH 8 by oxidizing mixed FeCl2-AlCl3 solutions. The unit-cell parameters a, b, and c were meas...