搜索结果: 1-15 共查到“矿床学与矿相学 Si”相关记录22条 . 查询时间(0.095 秒)
Inhibition of Sintering by Si During the Conversion of Si-Rich Ferrihydrite to Hematite
BET Ferrihydrite Si Sintering XPS
2011/12/2
Abstract: The distribution and chemical state of Si in a synthetic 2-line ferrihydrite with a Si/(Si + Fe) molar ratio of 0.11 was studied. Heat treatment under oxidizing conditions shows that Si-rich...
Khmaralite, a new beryllium-bearing mineral related to sapphirine: A superstructure resulting from partial ordering of Be, Al, and Si on tetrahedral sites
Khmaralite beryllium-bearing mineral related to sapphirine superstructure resulting partial ordering Be Al Si tetrahedral sites
2012/4/1
Khmaralite, Ca Mg Fe Fe Al Be B Si O , is a new mineral closely related to.04 5.46 14.26 1.43 0.02 4.80 400.12 1.87sapphirine from Khmara Bay, Enderby Land, Antarctica. It occurs in a pegmatite metamo...
The description of Al, Si ordering in aluminosilicates using the cluster variation method
cluster variatio nmethod Al Si cluster variation method
2012/3/30
Theclustervariationmethod(CVM)fordeterminingthethermodynamicsofbothshort-
rangeandlong-rangeorderinthisstudywasextendedtocomplexaluminosilicateminerals.
Usingrecentlydevelopedalgorithmsforthemaximiz...
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(...
Si,Al ordering in the double-ring silicate armenite, BaCa2Al6Si9O30?H2O: A single-crystal X-ray and 29Si MAS NMR study
BaCa2Al6Si9O30?H2O single-crystal
2012/3/30
29The SiMASNMRspectrumofarmenitefromWasenalp(Valais,Switzerland)indicates
completeSi,Alordering.Thesamechemicalshifts(82.3,95.0,and101.8ppm)were
alsomeasuredforarmenitefromRe!migny(Quebec,Canada),ho...
Melt viscosities in the system Na-Fe-Si-O-F-Cl: Contrasting effects of F and Cl in alkaline melts
Melt viscosities Na-Fe-Si-O-F-Cl alkaline melts
2012/4/1
The shear viscosities of melts in the system Na-Fe-Si-O-F-Cl were determined over a wide range of temperatures (400–1200 8 C) at 1 atm pressure in air. The compositions are based on the addition of Fe...
Boralsilite (Al 16 B 6 Si 2 O 37 ): A new mineral related to sillimanite from pegmatites in granulite-facies rocks
Boralsilite (Al 16 B 6 Si 2 O 37 ) pegmatites granulite-facies rocks
2012/3/31
Boralsilite, the first natural anhydrous Al-B-silicate, is a high-temperature phase in peg-matites cutting granulite-facies metapelitic rocks at Larsemann Hills, Prydz Bay, east Ant-arctica (type loca...
Si-Al ordering in leucite-group minerals and ion-exchanged analogues: An MAS NMR study
Si-Al leucite-group minerals ion-exchanged analogues MAS NMR study
2012/4/6
Twoseriesofleucitegroupmaterials,withK,Rb,andCsasextra-frameworkcations,havebeensynthesizedbyionexchangefromanaturalwell-orderedanalciteandanatural29 27disorderedleucite.Siand AlMASNMRdatafortheanalci...
Orthorhombic Jahn-Teller distortion and Si-OH in mozartite CaMn3+O[SiO3OH]: A single-crystal X-ray, FTIR, and structure modeling study
Orthorhombic Jahn-Teller distortion Si-OH CaMn3+O[SiO3OH X-ray FTIR: structure modeling study
2012/4/6
Thestructureofmozartite,CaMn O[SiO OH],wasre?nedinspacegroup P2 2 2 fromX-raysingle-crystaldatacollectedat100K(R 2.45%, R 2.62%),300K(R 2.60%,R 2.68%),and500K(R 2.79%, R 2.81%).TheMn O octahedronshows...
Exsolution and Al-Si disorder in alkali feldspars: Their analysis by infrared spectroscopy
Exsolution Al-Si disorder alkali feldspars analysis by infrared spectroscopy
2012/4/6
AnexperimentalmethodforthedeterminationofAb-OrexsolutionandAl-Siordering
inalkalifeldsparisdescribed.Powderinfraredspectroscopywasusedtomeasurespectra1
inthespectralrangebetween50and1500cm
usingabo...
Al, Si, and Mg occupancies in tetrahedrally and octahedrally coordinated sites in synthetic aluminous tremolite
Al Si Mg occupancies tetrahedrally octahedrally coordinated sites synthetic aluminous tremolite
2012/4/5
Aseriesofaluminoustremoliteswassynthesizedat800¤C85Cand6¤C13kbaralonthejoinCa
Mg Si O (OH) -Ca (Mg Al)(AlSi )O (OH) bymeansoftheMg-Tscher-
makssubstitution.Althoughtheamphiboleyieldswerehigh(97¤C99w...
Si-Al order and the I1 - I 2/c structural phase transition in synthetic CaAl2Si2O8- SrAl2Si2O8 feldspar: A 29Si MAS-NMR spectroscopic study
Si-Al order I1 - I 2/c structural phase transition synthetic CaAl2Si2O8- SrAl2Si2O8 feldspar A 29Si MAS-NMR spectroscopic study
2012/4/1
We present 29SiMAS-NMR spectroscopic data for a series of synthetic feldspar samples
along the join CaAI2Si20g-SrAI2Si20g, from which the composition dependence and cou-
pling of order parameters de...
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...
Bechererite, (Zn,Cu)6Zn2(OH)13[(Si,S)(O,OH)4]2, a novel mineral species from the Tonopah-Belmont mine, Arizona
Bechererite (Zn,Cu)6Zn2(OH)13[(Si,S)(O,OH)4]2 Tonopah-Belmont mine
2012/4/5
Bechererite is a new mineral found ondump material from the Tonopah-Belmont mine, Maricopa County, Arizona, U.S.A. It occurs as thin elongated crystals, commonly in hemispherical aggregates, and it is...
Coordination of Si in Na2O-SiO2-P2O5 glasses using Si K- and L-edge XANES
Coordination of Si Na2O-SiO2-P2O5 glasses Si K- and L-edge XANES
2012/4/5
Si K- and L-edge X-ray absorption near-edge structure (XANES) of SiOz-PzOs and NazO-SiOz-PzOs glasses containing PzOsabove 30mol%wereinvestigated using synchro-tron radiation. BothSiK-and L-edge spect...