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Structure and properties of magnetite formed in the presence of nickel(II) ions

Authors
Journal
Materials Research Bulletin
0025-5408
Publisher
Elsevier
Publication Date
Volume
33
Issue
11
Identifiers
DOI: 10.1016/s0025-5408(98)00162-7
Keywords
  • A. Oxides
  • B. Crystal Growth
  • C. Thermogravimetric Analysis (Tga)
  • C. Mössbauer Spectroscopy
  • D. Electrical Properties
Disciplines
  • Earth Science

Abstract

Abstract Fe 3O 4 particles prepared by oxidation of Fe(OH) 2 precipitated from FeCl 2 solutions containing different amounts of Ni 2+ from 0 to 30 mol% were examined by various means. The thermogravimetry (TG) results show that the addition of Ni 2+ raised the air-oxidation temperature of Fe 3O 4 particles from ca. 200 to ca. 400°C, which means that the Fe 3O 4 particles were stabilized to air-oxidation by the doped Ni 2+. Fe 2+ content of the materials obtained at Ni/(Ni + Fe) ≥ 0.1 mol% was significantly greater than the theoretical Fe 2+ content of Fe 3O 4. Fe 57 Mössbauer spectra indicated that Fe 3+ ions in B sites of the Ni-doped Fe 3O 4 are exchanged in part by Fe 2+. The dc electrical conductivity was increased from 10 −4 to 10 −2 S cm −1 by Ni 2+ loading.

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