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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...
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...
MAS NMR study of pentacoordinated magnesium in grandidierite
MAS NMR study pentacoordinated magnesium grandidierite
2012/4/5
The11.7T Mg, Al, Si,and BMASNMRspectraarereportedforwell-charac-terizedgrandidierite,(Mg,Fe)AlSiBO ,whichcontainsbothAlandMgin?vefoldcoor-dinationwithoxygen.TheMgspectrumisthe?rsttobereportedfor Mg,an...
19F MAS-NMR Study of Structural Fluorine in Some Natural and Synthetic 2:1 Layer Silicates
Clay minerals 19F MAS-NMR Fluorine Layer silicates Silicates Smectites
2011/12/30
High-resolution solid-state, fluorine-19, magic-angle spinning-nuclear magnetic resonance spectroscopy (MAS-NMR) was used to study natural and synthetic fluorinated 2:1 layer silicates of known compos...