The structure was studied by means of X-ray powder diffraction techniques, including the Rietveld method. This phase, which was isostructural with Na2VP2O8, was monoclinic (P21/c, a = 0.7739, b = 1.3611, c = 0.6294nm, β = 99.01º, Z = 4, V = 0.6548nm3). It consisted of [VP2O8] layers, parallel to the (010) plane, which were interleaved with Ag cations. This structure contained rather large tunnels which ran along [010] direction, where Ag cations were also located. Complex impedance electrical measurements were used to determine the ionic conductivity, and its variation with temperature and frequency. The activation energy for conduction was 0.58eV, and the conductivity was equal to 2.08 x 10-5 and 1.43 x 10-3S/cm at 558 and 673K, respectively.

A.Daidouh, M.L.Veiga, C.Pico: Journal of Solid State Chemistry, 1997, 130[1], 28-34