Fluorophosphate glasses activated by rare-earth ions and AgBr

Analysis of the absorption band position for colloidal silver in fluorophosphate glasses of the composition (0.95 - x - y)(MgCaBaSrAl2F14)-0.05Ba(PO3)(2)-xPbF(2)-yLnF(3) (where Ln = Eu, Ce, Sm, Tb; 0 a parts per thousand currency sign x a parts per thousand currency sign 0.2; y = 0.01, 0.02) with small additives of AgBr (0.04 wt % above 100%) has been performed. It has been shown that joint introduction of AgBr and EuF3 with additional heat treatment of the glasses below the temperature of the onset of crystallization leads to a rise of the plasmon absorption band of silver nanoparticles. It has been assumed that the reason for the observed shift of the plasmon absorption band is the formation of a similar to 0.5-nm-thick shell of AgBr on the surface of a metallic Ag (n) (0) -cluster.