Magnetic properties of cobalt-strontium-borate oxide glasses

The results of the temperature dependence of the magnetic susceptibility on xCoO · (1 − x)[2B2O3 · SrO]glasses with 0 < x ≤ 50 mol% are reported. The effective magnetic moment values suggest that the Co2+ ions are predominantly octahedral coordinated in low CoO content glasses, whereas in higher CoO content glasses the Co2+ ions are located in tetrahedral sites. Also θp values indicate that the Co2+ ions participate at the negative superexchange interaction for x ≥ 20 mol%.