Ammonium mediated hydrothermal synthesis of nanostructured hematite (α-Fe{sub 2}O{sub 3}) particles
- Zhejiang Test Academy of Quality and Technical Supervision, Hangzhou 310013 (China)
Highlights: ► Hydrothermal synthesis of nanostructured hematite (α-Fe{sub 2}O{sub 3}) particles. ► NH{sub 4}OH mediated direct transformation of micro-rod hematite to ellipsoidal particles. ► Ellipsoids formed by controlled aggregation, rather than directional growth. -- Abstract: Uniform α-Fe{sub 2}O{sub 3} particles of different shapes have been synthesized through hydrothermal process. The additives, the type of Fe(III) salts and reaction conditions in hydrothermal process were thoroughly investigated. The crystalline structure and morphology of the as-synthesized powder have been characterized by using X-ray powder diffraction, scanning electron microscopy and field emission scanning electron microscopy. Rod and ellipsoidal-shaped α-Fe{sub 2}O{sub 3} were obtained with ferric chloride as a precursor, while only irregular-shaped particles were synthesized by using ferric nitrate as precursors in the absence of NH{sub 4}OH. Direct transformation of micro-rod hematite to ellipsoidal particles with FeCl{sub 3} as precursor was also observed by adding NH{sub 4}OH. It is shown that the nanorod was formed through presumed directional aggregation of rapidly formed nucleus, while the formation of ellipsoidal hematite particles may undergo a nucleation–aggregation–dissolution–recrystallization process in the presence of ammonium.
- OSTI ID:
- 22215744
- Journal Information:
- Materials Research Bulletin, Vol. 47, Issue 9; Other Information: Copyright (c) 2012 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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