Synthesis and magnetic properties of magnetite-silicate nanocomposites derived from iron oxide of bacterial origin

Hideki Hashimoto, Tatsuo Fujii, Makoto Nakanishi, Yoshihiro Kusano, Yasunori Ikeda, Jun Takada

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Magnetic nanocomposites containing magnetite (Fe 3O 4) nanoparticles were prepared from iron oxide microtubules produced by Leptothrix ochracea, a species of water-habitant iron-oxidizing bacteria. The microtubules were mainly composed of Si-containing ferric hydroxide that shows a broad X-ray diffraction pattern similar to that of 2-line ferrihydrite. After moderate heat treatment in a reductive atmosphere above 325 °C, the ferric ions were partially reduced to a ferrous state, and nanocrystalline Fe 3O 4 with a spinel-type structure was formed in a noncrystalline silicate matrix. The average crystallite size of the Fe 3O 4 nanoparticles was estimated to be in the order of a few nanometers. The sample heat-treated at 500 °C exhibited considerable magnetization together with superparamagnetic behavior at room temperature, and super-spin-glass interaction occurred at low temperature. On further heat treatment above 530 °C, Fe 3O 4 was reduced to wüstite (Fe 1 -xO) and finally crystallized into iron metal (α-Fe) and ferrous silicate (Fe 2SiO 4).

Original languageEnglish
Pages (from-to)1156-1161
Number of pages6
JournalMaterials Chemistry and Physics
Volume136
Issue number2-3
DOIs
Publication statusPublished - Oct 15 2012

Fingerprint

Ferrosoferric Oxide
Silicates
Magnetite
Iron oxides
iron oxides
magnetite
silicates
Magnetic properties
Nanocomposites
nanocomposites
heat treatment
Iron
Heat treatment
Nanoparticles
magnetic properties
ferric ions
iron
nanoparticles
Spin glass
synthesis

Keywords

  • Amorphous materials
  • Heat treatment
  • Magnetic materials
  • Magnetometer (for magnetic field, susceptibility, magnetic moment, magnetisation measurements)
  • Nanostructures

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Synthesis and magnetic properties of magnetite-silicate nanocomposites derived from iron oxide of bacterial origin. / Hashimoto, Hideki; Fujii, Tatsuo; Nakanishi, Makoto; Kusano, Yoshihiro; Ikeda, Yasunori; Takada, Jun.

In: Materials Chemistry and Physics, Vol. 136, No. 2-3, 15.10.2012, p. 1156-1161.

Research output: Contribution to journalArticle

Hashimoto, Hideki ; Fujii, Tatsuo ; Nakanishi, Makoto ; Kusano, Yoshihiro ; Ikeda, Yasunori ; Takada, Jun. / Synthesis and magnetic properties of magnetite-silicate nanocomposites derived from iron oxide of bacterial origin. In: Materials Chemistry and Physics. 2012 ; Vol. 136, No. 2-3. pp. 1156-1161.
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