Study of natural and ion exchanged vermiculite by emanation thermal analysis, TG, DTA and XRD

0163512 - UACH-T 20033063 RIV NL eng J - Journal Article
PŞez-Maqueda, L. A. - Balek, V. - Poyato, J. - Pérez-Rodriquez, J. L. - Šubrt, Jan - Boutsewa, I. M. - Beckman, I. N. - Málek, Z.
Study of natural and ion exchanged vermiculite by emanation thermal analysis, TG, DTA and XRD.
Journal of Thermal Analysis and Calorimetry. Roč. 71, č. 3 (2003), s. 715-726. ISSN 1388-6150. E-ISSN 1588-2926
R&D Projects: GA MŠMT LN00A028
Institutional research plan: CEZ:AV0Z4032918
Keywords : emanation thermal analysis * DTA * ion exchange
Subject RIV: CA - Inorganic Chemistry
Impact factor: 1.094, year: 2003

Emanation thermal analysis (ETA), thermogravimetry, DTA and XRD were used in thermal characterization of natural vermiculite (Santa Olalla, Huelva, Spain) and of Na+- and NH4+- exchanged vermiculite samples during heating in air in the range 25-1100degreesC. 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.
Permanent Link: http://hdl.handle.net/11104/0060742