Chargelocationeffectonthehydrationpropertiesofsyntheticsaponiteandhectorite saturated byNa+, Ca2+cations:XRDinvestigation

Thispaperaimsatcomparingtheeffectofchargelocationonthehydrationpropertiesof twotrioctahedral syntheticminerals:saponiteandhectorite. Thesampleswerecharacterisedbyalayerchargeof 0.4charge perhalfunitcellandweresaturatedwithNa+orCa2+. Thehydrationbehaviourwasstudiedbydetermining thestructural characte...

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Veröffentlicht in:	Applied clay science 2009, Vol.46, p.43-50
Hauptverfasser:	Karmous, M.S., Benrhaiem, H., Robert, J.L., Lansonc, B., Benhaj Amara, A.
Format:	Artikel
Sprache:	eng
Schlagworte:	Earth Sciences Mineralogy Sciences of the Universe
Online-Zugang:	Volltext
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Zusammenfassung:	Thispaperaimsatcomparingtheeffectofchargelocationonthehydrationpropertiesof twotrioctahedral syntheticminerals:saponiteandhectorite. Thesampleswerecharacterisedbyalayerchargeof 0.4charge perhalfunitcellandweresaturatedwithNa+orCa2+. Thehydrationbehaviourwasstudiedbydetermining thestructural characteristicswhichwereobtainedbymodellingXRDpatterns. XRDpatternswererecordedundercontrolledrelativehumidity(RH). Thehydratedstatesof Ca-hectorite weremorehomogeneousthanthoseofsaponitewhereasthetransitionfrom1Wto2WoccurredatlowerRH rates for saponitethanfor hectorite. For heterogeneous samples, the1Wand2Wlayers werestacked randomlyfashionforhectorite. Na-saponite-0.4andCa-saponite-0.4weremadeupof typesof layer; one waterlayer(1W)andtwo-waterlayers(2W). Thestackingof theselayersshowedsomesegregation.
ISSN:	0169-1317
DOI:	10.1016/j.clay.2009.07.007