搜索结果: 1-15 共查到“地质学 a-Si:H”相关记录25条 . 查询时间(0.313 秒)
硅（Si）是地球中丰度第三高的元素，也是地壳中丰度第二高的元素。虽然高温岩浆活动和变质作用通常产生较小的Si同位素分馏，但低温化学反应和生物过程所导致的Si同位素分馏却十分显著。因此，全岩和/或矿物Si同位素已被广泛用作壳内重熔和壳-幔相互作用的示踪剂。锆（Zr）是高场强元素之一，也是后期蚀变和化学风化过程中最不活动的元素，其稳定同位素体系可以敏感地示踪硅酸盐岩浆系统的分异过程。
Si^4＋及过渡金属离子在蓝宝石呈色中的作用——数学分析法在离子致色研究中的应用
蓝宝石 晶格 元素 波长－吸收系数图
2001/6/30
理想晶体（包括蓝宝石）的颜色与占据其晶格的微量过渡金属元素的种类及含量有直接的关系。玄武岩产状的蓝宝石中含有多种微量元素，这些元素是蓝宝石致色的直接因素。本文通过研究发现，每种微量元素均对可见光的特定波段产生不同程度的吸收，其中，Fe^3 ,Si^4 是使蓝宝石呈现蓝色的主要离子，Cr^3 离子可使蓝宝石呈橙和绿色，Mn^4 离子可使蓝宝石呈黄色，Co^2 离子也可使蓝宝石呈蓝色。本文还做出了蓝宝...
Inhibition of Sintering by Si During the Conversion of Si-Rich Ferrihydrite to Hematite
BET Ferrihydrite Si Sintering XPS
2000/12/1
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
1999/10/6
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
1999/3/5
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
1999/3/2
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
1999/1/3
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
1998/9/30
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
1998/5/30
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...
碱性长石中Al—Si分布的计算方法讨论：以江西相山及山东七宝山火山
碱性长石 火山－侵入杂岩 杂岩
1997/12/31
碱性长石的结构状态是其温压条件，特别是冷却速度的反映。对碱性长石的结构态，目前国内均是采用Ｘ－射线衍射资料中０６０峰是２０４峰的２θ值来求解的，但单斜晶系的碱性长石２０４峰常被其它峰叠覆。Ｈｏｖｉｓ在对碱性长石的Ｘ－射弛衍射资料作系统研究的基础上，提出了用１１３峰及０６０峰来计算单斜碱性长石不同四面体位置Ａｌ占位率的方法。
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
1997/11/12
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
1997/9/10
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
1997/9/10
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
1997/3/4
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
1997/1/3
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...