Mössbauer Study of Transformation of Fe Cations during Thermal Treatment of Glauconite in Air

0383700 - ÚGN 2013 RIV US eng C - Konferenční příspěvek (zahraniční konf.)
Mašláň, M. - Martinec, Petr - Kašlík, J. - Kovářová, E. - Ščučka, Jiří
Mössbauer Study of Transformation of Fe Cations during Thermal Treatment of Glauconite in Air.
Mössbauer spectroscopy in materials science - 2012 : proceedings of the International Conference MSMS-12, Olomouc, Czech Republic, 11-15 June 2012. Melville: American Institute of Physics, 2012 - (Tuček, J.; Machala, L.), s. 169-173. AIP Conference Proceedings. ISBN 978-0-7354-1101-2. ISSN 0094-243X.
[Mössbauer Spectroscopy in Materials Science 2012. Olomouc (CZ), 11.06.2012-15.06.2012]
Grant CEP: GA MŠMT ED2.1.00/03.0082
Grant ostatní: GA ČR(CZ) GA106/08/1440; GA ČR(CZ) GA205/08/0869; GA MŠk(CZ) 1M6198959201
Program: GA
Institucionální podpora: RVO:68145535
Klíčová slova: glauconite * thermal decomposition * maghemite * Mössbauer spectroscopy
Kód oboru RIV: CB - Analytická chemie, separace
http://www.deepdyve.com/lp/american-institute-of-physics/mo-ssbauer-study-of-transformation-of-fe-cations-during-thermal-CMBsTKkgNo

Thermal decomposition of glauconite in air was studied by optical microscopy, thermal analysis, X-ray diffraction and Mössbauer spectroscopy. The glauconite structure keeps preserved during thermal treatment up to 800°C; however, simultaneously, a progressive transformation of Fe2+ and Fe 3+ ions in glauconite structure and water leaving the crystal structure are both observed inducing the symmetry lowering of the iron octahedral positions. The destruction of glauconite structure begins after heating at 900°C and becomes more intensive with an increase in the treatment temperature. Simultaneously, with the glauconite structure destruction, iron leaving the glauconite structure oxidizes to γ-Fe2O3, which transforms to α-Fe2O3.
Trvalý link: http://hdl.handle.net/11104/0213557