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Thermal behaviour of synthetic pyroaurite-like anionic clay
- 1.0163584 - UACH-T 20033071 RIV NL eng J - Journal Article
Kovanda, F. - Balek, Vladimír - Dorničák, V. - Martinec, P. - Mašláň, M. - Bílková, L. - Koloušek, D. - Bountsewa, I. M.
Thermal behaviour of synthetic pyroaurite-like anionic clay.
Journal of Thermal Analysis and Calorimetry. Roč. 72, č. 1 (2003), s. 727-737. ISSN 1388-6150. E-ISSN 1588-2926
R&D Projects: GA MŠMT LN00A028; GA ČR GA202/00/0982; GA ČR GA106/02/0523
Institutional research plan: CEZ:AV0Z4032918
Keywords : layered double hydroxide * pyroaurite-like anionic clay * thermal decomposition
Subject RIV: CA - Inorganic Chemistry
Impact factor: 1.094, year: 2003
Thermal behaviour of synthetic pyroaurite-like anionic clay with molar ratio Mg/Fe=2 was studied in the range of 60-1100degreesC during heating in air. TG/DTA coupled with evolved gas analysis, emanation thermal analysis (ETA), surface area measurements, XRD, IR and Mossbauer spectroscopy were used. Microstructure changes characterized by ETA were in a good agreement with the results of surface area measurements and other methods. After the thermal decomposition of the pyroaurite-like anionic clay, which took place mainly up to 400degreesC, a predominantly amorphous mixture of oxides is formed. A gradual crystallization of MgO (periclase) and Fe2O3 (maghemite) was observed at 400-700degreesC by XRD. The MgFe2O4 spine] and periclase were detected at 800-1100degreesC. The spinel formation was also confirmed by Mossbauer spectroscopy.
Permanent Link: http://hdl.handle.net/11104/0060810
Number of the records: 1