Atomic scale study of thermal reduction of nano goethite coexisting with magnetite

Evolution of the local structure and magnetic properties of nano particles of goethite having magnetite as a composite due to controlled annealing treatments in vacuum has been studied using Mossbauer spectroscopy. Importance of size, defect associated with structural OH- for the observed structural...

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Bibliographic Details
Published in:AIP advances 2013-02, Vol.3 (2), p.022101-022101
Main Authors: singh, L. Herojit, Govindaraj, R., Mythili, R., Amarendra, G., Sundar, C. S.
Format: Article
Language:English
Subjects:
Annealing
Conversion
Magnetic properties
Magnetite
Nanocomposites
Nanomaterials
Nanostructure
Reduction
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Summary:Evolution of the local structure and magnetic properties of nano particles of goethite having magnetite as a composite due to controlled annealing treatments in vacuum has been studied using Mossbauer spectroscopy. Importance of size, defect associated with structural OH- for the observed structural and magnetic properties of goethite has been emphasized in this study. Present Mossbauer results show that thermal annealing at low temperatures (420-550 K) lead to a partial conversion / reduction of orthorhombic goethite to cubic spinel oxides such as maghemite and off-stochiometric magnetite. This study further establishes that annealing treatments beyond 650 K predominantly results in topotactic conversion of goethite to haematite. Underlying physics of the transitions of goethite to iron oxides and the important role of desorbed hydrogen for the orthorhombic to cubic structural transitions has been elucidated in this study.
ISSN:2158-3226
2158-3226
DOI:10.1063/1.4790614