Study of natural and ion exchanged vermiculite by emanation thermal analysis,TG, DTA and XRD |
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| Authors: | Pérez-Maqueda L A Balek V Poyato J Pérez-Rodríquez J L Šubrt J Bountsewa I M Beckman I N Málek Z |
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| Institution: | (1) Sevilla Instituto de Ciencia de Materiales de Sevilla, CSIC-UNSE, c/. Américo Vespucio, s/n, 41092 Sevilla, Spain;(2) Řež Institute of Inorganic Chemistry, Academy of Sciences of the Czech Republic, 250 68 Řež, Czech Republic;(3) Instituto de Ciencia de Materiales de Sevilla (CSIC-UNSE), Avda. Americo Vespucio s/n, 41092 Sevilla, Spain;(4) Chemical Faculty, Moscow State University, 119899 Moscow, GSP-3, Russia;(5) Nuclear Research Institute Řež, CZ-25068 Řež, Czech Republic |
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| Abstract: | Emanation thermal analysis (ETA), thermogravimetry, DTA and XRD were used in thermal characterization of natural vermiculite
(Santa Olalla, Huelva, Spain) and of Na+- and - exchanged vermiculite samples during heating in air in the range 25-1100°C. A good agreement between the results of
these methods was found. Changes in the radon release rate measured by ETA, which reflected the decrease and collapse of the
interlayer space after the release of water as well as the formation of new crystalline phases were evaluated using a mathematical
model. The model used for the evaluation was found suitable for the quantitative characterization of microstructure changes
during in situ conditions of heating of vermiculite samples.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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| Keywords: | DTA vermiculite microstructure emanation thermal analysis ion exchange TG XRD |
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