EPR and magnetic investigations of copper ions in 2B2O3·As2O3 glass matrix

Abstract The results obtained by paramagnetic electron resonance (EPR) and magnetic susceptibility on the xCuO·(100−x)[2B2O3·As2O3] glasses with 0 x ⩽ 30 mol%, are reported. From the EPR absorption spectra octahedral axially distorted environments of the Cu2+ ions were detected. Both EPR and magnetical data reveals at samples with x>15 mol% the presence of copper ions as Cu+ and Cu2+ species. No superexchange interactions between copper ions were revealed.