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

N. Mizutani, T. Iwasaki, S. Watano, T. Yanagida, H. Tanaka, T. Kawai

Research output: Contribution to journalArticle

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Abstract

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 nanopartides 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.

Original languageEnglish
Pages (from-to)713-717
Number of pages5
JournalBulletin of Materials Science
Volume31
Issue number5
DOIs
Publication statusPublished - Oct 1 2008
Externally publishedYes

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Magnetite Nanoparticles
Magnetite nanoparticles
Hydrothermal synthesis
Ferrosoferric Oxide
Ions
Magnetite
SQUIDs
Reducing Agents
Diffractometers
Reducing agents
Crystallites
Oxidants
Powders
Magnetic properties
Nucleation
Electron microscopes
Particle size
Scanning
X rays
Crystals

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials

Cite this

Effect of ferrous/ferric ions molar ratio on reaction mechanism for hydrothermal synthesis of magnetite nanoparticles. / Mizutani, N.; Iwasaki, T.; Watano, S.; Yanagida, T.; Tanaka, H.; Kawai, T.

In: Bulletin of Materials Science, Vol. 31, No. 5, 01.10.2008, p. 713-717.

Research output: Contribution to journalArticle

Mizutani, N. ; Iwasaki, T. ; Watano, S. ; Yanagida, T. ; Tanaka, H. ; Kawai, T. / Effect of ferrous/ferric ions molar ratio on reaction mechanism for hydrothermal synthesis of magnetite nanoparticles. In: Bulletin of Materials Science. 2008 ; Vol. 31, No. 5. pp. 713-717.
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AU - Iwasaki, T.

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AU - Tanaka, H.

AU - Kawai, T.

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