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Título: | Thermal characterization of Montmorillonite clays saturated with various cations |
Autor: | Balek, V.; Benes, M.; Subrt, Jan; Pérez-Rodríguez, José Luis CSIC; Sánchez-Jiménez, P.E. CSIC ORCID CVN; Pérez-Maqueda, Luis A. CSIC ORCID; Pascual-Cosp, José | Fecha de publicación: | 2008 | Editor: | Springer Nature | Citación: | Journal of thermal Analysis and Calorimetry 92: 191-197 (2008) | Resumen: | Emanation thermal analysis (ETA), thermogravimetry and high temperature XRD were used to characterize the thermal behavior during dehydration of natural Na montmorillonite (Upton Wyoming, USA) and homoionic montmorillonite (MMT) samples saturated with different cations, i.e. Li+, Cs+, NH 4 +, Mg2+ and Al3+. ETA results characterized radon mobility and microstructure changes that accompanied the mass loss of the samples due to dehydration on heating in air. A collapse of interlayer space between the silicate sheets after water release from the MMT samples was characterized by a decrease of the radon release rate, ΔE. Decreases in c-axis basal spacing (d 001) values determined from XRD patterns for the different montmorillonite samples follow the sequence: Mg−MMT>Al−MMT>Li−MMT>Na−MMT>NH4−MMT>Cs−MMT The decrease of the radon release rate (ΔE) determined by ETA that characterized microstructure changes due to collapse of interlayer space corresponded well to differences in the c-axis basal spacing (Δd 001) values determined from the XRD patterns before and after samples dehydration. | URI: | http://hdl.handle.net/10261/97249 | DOI: | 10.1007/s10973-007-8761-9 | Identificadores: | doi: 10.1007/s10973-007-8761-9 issn: 1572-8943 |
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2008 JTAC Thermal characterization of montmorillonite clays saturated with various cations.pdf | 277,6 kB | Adobe PDF | Visualizar/Abrir |
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