Variability in sepiolite: diffraction studies

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dc.contributor.authordel Río, MSen_AU
dc.contributor.authorGarcía-Romero, Een_AU
dc.contributor.authorSuárez, Men_AU
dc.contributor.authorda Silva, Ien_AU
dc.contributor.authorFuentes-Montero, Len_AU
dc.contributor.authorMartinez-Criado, Gen_AU
dc.date.accessioned2011-12-13T23:02:38Zen_AU
dc.date.available2011-12-13T23:02:38Zen_AU
dc.date.issued2011-10-01en_AU
dc.date.statistics2011-12-14en_AU
dc.description.abstractTwenty sepiolites of known composition from different origins were analyzed to quantify the variability in structural parameters and its possible relationships with composition and morphology. Morphology SEM analyses led to classify the sepiolites into several groups, beyond the two simple macroscopic or clay groups. X-ray powder diffraction with synchrotron light was used to discuss the variability of the a and b cell parameters with the nature of the cations and occupancy of the octahedral shell. Rietveld refinement using the ideal sepiolite model is performed on sepiolites at two temperatures: 225 degrees C (for zeolitically dehydrated sepiolite) and 25 degrees C (for hydrated ambient sepiolite). The latter permitted to locate ca. six molecules of the zeolitic H(2)O within the tunnels. A few samples were selected to evaluate the feasibility and potential of single-crystal diffraction methods: X-ray microdiffraction and electron diffraction. The macroscopic sepiolites gave well-structured and rich X-ray fiber diffraction patterns, in excellent agreement with ab initio simulations. High-quality single-crystal electron diffraction patterns for three axis zones are indexed and compared with simulations. The experimental and modeling results for X-ray microdiffraction and electron diffraction open a new path for quantitative crystallography on sepiolite and other fibrous clays from the sepiolite-palygorskite group. © 2011, Mineralogical Society of Americaen_AU
dc.identifier.citationdel Río, M. S., García-Romero, E., Suárez, M., da Silva, I., Fuentes-Montero, L., & Martinez-Criado, G. (2011). Variability in sepiolite: diffraction studies. American Mineralogist, 96(10), 1443-1454. doi:10.2138/am.2011.3761en_AU
dc.identifier.govdoc3892en_AU
dc.identifier.issn0003-004Xen_AU
dc.identifier.issue10en_AU
dc.identifier.journaltitleAmerican Mineralogisten_AU
dc.identifier.pagination1443-1454en_AU
dc.identifier.urihttp://dx.doi.org/10.2138/am.2011.3761en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/3944en_AU
dc.identifier.volume96en_AU
dc.language.isoenen_AU
dc.publisherGeoScienceWorlden_AU
dc.subjectSepioliteen_AU
dc.subjectX-ray diffractionen_AU
dc.subjectClaysen_AU
dc.subjectPesticidesen_AU
dc.subjectDiffractionen_AU
dc.subjectTurkeyen_AU
dc.titleVariability in sepiolite: diffraction studiesen_AU
dc.typeJournal Articleen_AU
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