The121Sb Mössbauer spectra of antimony-containing glasses

The121Sb Mossbauer spectra of a series of Na2O-B2O3-Sb2O3, (Na2O, 2P2O5) + Sb2O3, and (Na2O, 2SiO2) + Sb2O3 glasses have been measured. The chemical isomer shifts,δ, and the quadrupole couplings,eQVzz, for antimony (III) in different glasses have been estimated. From the changes of isomer shift is has been deduced that the ionicity of the Sb-O bond increases with decreasing Na2O content in Na2O-B2O3-Sb2O3 glasses; and when the network former is changed, with equivalent molar composition, the ionicity of the Sb-O bond increased in the order borate ⩽ silicate < phosphate.