000013178 001__ 13178
000013178 005__ 20131002113905.0
000013178 0248_ $$aoai:doc.rero.ch:20091210085918-WH$$punifr$$ppostprint$$prero_explore$$zcdu34$$zthesis_urn$$zreport$$zthesis$$zbook$$zjournal$$zcdu549$$zcdu16$$zpreprint$$zcdu1$$zdissertation
000013178 041__ $$aeng
000013178 080__ $$a549
000013178 100__ $$aFischer, Håkon$$uInstitute of Geophysics,ETHZurich, Switzerland
000013178 245__ $$9eng$$aThe transformation of synthetic hectorite in the presence of Cu(II)
000013178 269__ $$c2009
000013178 520__ $$9eng$$aThe influence of Cu(II) on the hydrothermal and thermal transformations of a synthetic hectorite was investigated by a combined approach using mainly X-ray diffraction, thermal analyses, and electron paramagnetic resonance spectroscopy. The presence of Cu(II) during hydrothermal treatment increased the crystallite size. Copper (II) was both structure-bound and associated with the inner surfaces of the particles. Upon heating, structural destabilization of the hectorite began at ∼400°C as indicated by the formation of free radicals. Between 600 and 700°C, the hectorite converted to enstatite, and in the presence of Cu(II), to enstatite and richterite. The formation of richterite as an additional conversion product is explained by the creation of structural weakness due to structure-bound Cu(II) in F-containing hectorite. Our results suggest that traces of Cu(II), typical of natural environments, may influence the conversion products in high-temperature geochemical systems.
000013178 695__ $$9eng$$aCu(II) ; DSC ; EPR ; hectorite ; hydrothermal treatment ; TG ; XRD
000013178 700__ $$aWeidler, Peter G.$$uForschungszentrum Karlsruhe, Institute for Technical Chemistry, Water and Geotechnology, Germany
000013178 700__ $$aGrobéty, Bernard$$uInstitutdeMinéralogie,Université deFribourg, Switzerland
000013178 700__ $$aLuster, Jörg$$uSwiss Federal Institute for Forest, Snow, and Landscape Research, Birmensdorf, Switzerland
000013178 700__ $$aGehring, Andreas U.$$uInstitute of Geophysics,ETHZurich, Switzerland
000013178 773__ $$g2009/57/2/139-149$$tClays and Clay Minerals
000013178 775__ $$gPublished version$$ohttp://dx.doi.org/10.1346/CCMN.2009.0570201
000013178 8564_ $$fgrobety_tsh.pdf$$qapplication/pdf$$s1282959$$uhttp://doc.rero.ch/record/13178/files/grobety_tsh.pdf$$yorder:1$$zpdf
000013178 918__ $$aFaculté des sciences$$bDécanat, Ch. du Musée 6A, 1700 Fribourg$$cGéosciences
000013178 919__ $$aUniversité de Fribourg$$bFribourg$$ddoc.support@rero.ch
000013178 980__ $$aPOSTPRINT$$bUNIFR$$fART_JOURNAL
000013178 990__ $$a20091210085918-WH