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Glasses from the lead borate system of the composition 50%PbO-50%B2O3 together with samples containing different concentrations of 3d-transition metal (TM) species from V to Zn were prepared by the melting-quenching technique and their optical properties were investigated. The X-ray absorption near edge spectra of V, Cr, and Mn-doped glasses indicates that the oxidation states of V(IV/V), Cr(III,...
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