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Intrinsic magnetic properties of BixCo2-xMnO 4 spinels obtained by short-time etching
  • Universidade Estadual Paulista (UNESP)
  • Université de Rennes 1
We report the structural and magnetic properties of Co2MnO 4, partially substituted by Bi at the octahedral site. Bismuth enhances ferromagnetism due to a decrease of the Co2+-Co2+ antiferromagnetic interactions and an increase of the Mn3+-Mn 4+ exchanges. Spurious phases (magnetic and/or nonmagnetic oxides) can easily form because of the large differences between the ionic radii of Bi3+ and Co3+, hiding or altering the intrinsic physical properties of the main BixCo2-xMnO4 phase. An easy way to eliminate the secondary phases is using acid reagents. Short-time etching of Bi0.1Co1.9MnO4 using nitric acid was successfully used, keeping most of the properties of the initial compound, with no alteration of the crystallographic structure. Final stoichiometry was respected (∼Bi0.08Co1.82MnO4), meaning that the material after etching definitely contains bismuth elements in its structure and the observed properties are intrinsic to the oxide spinel. Additional experiments were performed as a function of the synthesis conditions, showing that an optimal pH value of 7 allowed the best magnetic response of the non-doped material. © 2013 Elsevier B.V. All rights reserved.
Issue Date: 
Journal of Magnetism and Magnetic Materials, v. 339, p. 157-162.
Time Duration: 
  • Etching
  • Ferrimagnetism
  • Multiferroics
  • Oxide spinel
  • pH
  • Additional experiments
  • Antiferro-magnetic interactions
  • Crystallographic structure
  • Magnetic response
  • Oxide spinels
  • Structural and magnetic properties
  • Synthesis conditions
  • Bismuth
  • Bismuth compounds
  • Carbon dioxide
  • Magnetic properties
  • Manganese
  • Manganese oxide
  • Stoichiometry
  • Cobalt compounds
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Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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