Synthesis and characterization of manganese and cobalt pyroborates: M2B2O5 (M = Mn,Co) |
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Authors: | Tetsuya Kawano Haruhiko Morito Hisanori Yamane |
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Institution: | Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan |
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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 Mn2+ and Co2+ ions were observed at 250–650 nm in the diffuse reflection spectra. The optical absorption edges of Mn2B2O5 and Co2B2O5 were at 243 nm (5.11 eV) and 299 nm (4.15 eV), respectively. |
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