Synthesis and characterization of manganese and cobalt pyroborates: M 2B2O5 (M = Mn, Co)

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Abstract

The magnetic property of Co2B2O5 and the optical property of M2B2O5 (M = Mn, Co) were investigated. Co2B2O5 showed antiferromagnetic behavior below the Néel temperature of TN ≈ 45 K, and the Weiss temperature was TW = +7.7 K. The effective magnetic moment of Co was 4.96 μB, which indicated that Co was divalent and in a high-spin state. Absorptions attributed to the d-d transitions in Mn 2+ and Co2+ ions were observed at 250-650 nm in the diffuse reflection spectra. The optical absorption edges of Mn2B 2O5 and Co2B2O5 were at 243 nm (5.11 eV) and 299 nm (4.15 eV), respectively. Diffuse reflection spectra of M2B2O5 (M = Mn, Co) measured at room temperature. In addition to the absorption edges, the absorptions attributed to the d-d transitions in Mn2+ and Co2+ ions were observed at 250-650 nm.

Original languageEnglish
Pages (from-to)1419-1421
Number of pages3
JournalSolid State Sciences
Volume12
Issue number8
DOIs
Publication statusPublished - 2010 Aug

Keywords

  • Diffuse reflection
  • Magnetic susceptibility
  • Solid state reaction
  • Transition metal borates

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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