Abstract
The magnetic property of Co 2B 2O 5 and the optical property of M 2B 2O 5 ( M = Mn, Co) were investigated. Co 2B 2O 5 showed antiferromagnetic behavior below the Néel temperature of T N ≈ 45 K, and the Weiss temperature was T W = +7.7 K. The effective magnetic moment of Co was 4.96 μ B, which indicated that Co was divalent and in a high-spin state. Absorptions attributed to the d–d transitions in Mn 2+ and Co 2+ ions were observed at 250–650 nm in the diffuse reflection spectra. The optical absorption edges of Mn 2B 2O 5 and Co 2B 2O 5 were at 243 nm (5.11 eV) and 299 nm (4.15 eV), respectively.
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