Ionic conductivity of and Raman spectroscopy investigation in binary oxosalts (1 - x)AgPO 3 xAg 2SO 4 glasses

(1 - x)AgPO ₃ xAg ₂SO ₄ homogeneous glasses obtained by quenching of a melt of the two salts are pure ionic Ag ⁺ conductors. The RT conductivity is increased from 2.5 × 10 ^-7 to 4 × 10 ^-6 (Ω cm) ^-1 when the ratio of Ag ₂SO ₄ is increased from 0 to 0.3. Raman spectroscopy shows that no modifications of the (PO ₃) ^∞ chain skeleton occur by adding Ag ₂SO ₄. The low-frequency Raman band lying at about 55 cm ^-1 is quantitatively correlated to Ag ⁺ oscillations, the hopping distance decreasing from 3.0 to 2.7 Å if a jump process between regular Ag ⁺ sites is considered.