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ChemInform Abstract: Particle Size Effects on the Thermal Behavior of Maghemite Synthesized by Flame Pyrolysis.

✍ Scribed by S. GRIMM; T. STELZNER; J. LEUTHAEUSSER; S. BARTH; K. HEIDE

Publisher: John Wiley and Sons
Year: 2010
Weight: 29 KB
Volume: 28
Category: Article
ISSN: 0931-7597
DOI: 10.1002/chin.199748003

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✦ Synopsis

1997 mechanical properties, thermal properties mechanical properties, thermal properties D 3000

48 -003

Particle Size Effects on the Thermal Behavior of Maghemite Synthesized by Flame Pyrolysis.

-The particle size of maghemite (γ-Fe2O3) powder, prepared by flame pyrolysis of iron-containing solutions, decreases with decreasing Fe3+-concentration in the solution. Heating of powders with particle sizes above 15 nm in Ar atmosphere leads to a transformation of maghemite to hematite (α-Fe2O3), while smaller particles transform into magnetite (Fe3O4). This phenomenon is attributed to adsorbed or incorporated reducing carboxylate groups formed during powder synthesis. Reaction mechanisms with maghemite particles are discussed. -(GRIMM, S.; STELZNER, T.; LEUTHAEUSSER,

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