The conductivity and structure of (CsI)x-(AgPO3)1–x glasses, where x was 0 to 0.2, were investigated by means of dielectric spectroscopy, X-ray and neutron diffraction, and reverse Monte Carlo modelling. Evidence was found for a partial dissociation of Ag ions from O sites into I-rich environments upon addition of CsI. A similar dissociation effect, although stronger, had previously been found in PbI2-doped AgPO3 glasses, where it, together with network expansion, was considered to cause a much higher dc conductivity of PbI2-doped AgPO3 glasses as compared to AgI-doped AgPO3 glasses. However, the dc conductivity was much lower in the present CsI-doped glasses than in Pbl2-doped glasses. This was explained on the basis that the conductivity in salt-doped AgPO3 was determined by 3 effects: network expansion, partial Ag dissociation and a mixed mobile ion effect. The last effect, which reduced the conductivity, was present when the salt cations (Cs ions in this case) were mobile.

Structural Properties Determining the Ionic Conductivity of CsI-Doped AgPO3 Glasses. C.Karlsson, C.Meneghini, J.Swenson: Physical Review B, 2004, 69[22], 224209 (8pp)