Abstract
The results of the temperature dependence of the magnetic susceptibility on xCoO · (1 − x)[2B 2O 3 · SrO]glasses with 0 < x ≤ 50 mol% are reported. The effective magnetic moment values suggest that the Co 2+ ions are predominantly octahedral coordinated in low CoO content glasses, whereas in higher CoO content glasses the Co 2+ ions are located in tetrahedral sites. Also θ p values indicate that the Co 2+ ions participate at the negative superexchange interaction for x ≥ 20 mol%.
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