Effect of ferrous/ferric ions molar ratio on reaction mechanism for hydrothermal synthesis of magnetite nanoparticles

Magnetite nanoparticles were prepared by hydrothermal synthesis under various initial ferrous/ferric molar ratios without adding any oxidizing and reducing agents in order to clarify effects of the molar ratio on the reaction mechanism for the formation of magnetite nanoparticles. The magnetite nano...

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Bibliographic Details
Published in:Bulletin of materials science 2008-10, Vol.31 (5), p.713-717
Main Authors: Mizutani, N., Iwasaki, T., Watano, S., Yanagida, T., Tanaka, H., Kawai, T.
Format: Article
Language:English
Subjects:
Chemical synthesis
Chemistry and Materials Science
Crystallinity
Crystallites
Electron microscopes
Engineering
Ferric ions
Ferrous hydroxide
Hydrothermal crystal growth
Magnetic properties
Magnetite
Materials Science
Nanoparticles
Nucleation
Ratios
Reaction mechanisms
Reducing agents
Scanning electron microscopy
SQUIDs
Superconducting quantum interference devices
Synthesis
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Summary:Magnetite nanoparticles were prepared by hydrothermal synthesis under various initial ferrous/ferric molar ratios without adding any oxidizing and reducing agents in order to clarify effects of the molar ratio on the reaction mechanism for the formation of magnetite nanoparticles. The magnetite nanoparticles prepared were characterized by a scanning electron microscope, powder X-ray diffractometer, and superconducting quantum interference device (SQUID). At the molar ratio corresponding to the stoichiometric ratio in the synthesis reaction of magnetite from ferrous hydroxide and goethite, the nucleation of magnetite crystals progressed rapidly in an initial stage of the hydrothermal synthesis, resulting in formation of the magnetite nanoparticles having a smaller size and a lower crystallinity. On the other hand, at higher molar ratios, the particle size and crystallinity increased with increasing molar ratio because using surplus ferrous hydroxide the crystallites of magnetite nanoparticles grew up slowly under hydrothermal conditions according to the Schikorr reaction. The magnetite nanoparticles prepared under various molar ratios had good magnetic properties regardless of the molar ratio.
ISSN:0250-4707
0973-7669
DOI:10.1007/s12034-008-0112-3