Abstract
Positron lifetime and annihilation photon angular correlation studies have been performed in glasses of molar composition xNa2O, (1-x)B2O3. A strong dependence of the lifetime parameters on composition, x, is attributed to underlying changes in both disorder and free volume. Additional investigations of the effect of vanadium doping in a sodium borate 0.2Na2O, 0.8B2O3 glass and a calcium phosphate 0.5CaO, 0.5P2O5 glass suggest a further positronium inhibition mechanism. An interpretation based on electron scavenging by the transition metal impurities is tentatively proposed.
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