Characterization and characteristics of mechanochemically synthesized amorphous fast ionic conductor 50 SISOMO (50AgI–25Ag 2O–25MoO 3)

Abstract

Mechanochemically synthesized amorphous 50 SISOMO [50AgI–25Ag 2O–25MoO 3] fast ionic conductor shows high ionic conductivity of ∼6 × 10 −3Ω −1 cm −1 at room temperature. The highest ionic conductivity is achieved for 36 h milled sample, which is more than three orders of magnitude higher that of crystalline AgI at room temperature. The samples are thermally stable at least up to ∼70 °C. Thermoelectric power studies on 50 SISOMO amorphous fast ionic conductors (a-SIC) have been carried out in the temperature range 300–330 K. Thermoelectric power ( S) is found to vary linearly with the inverse of the absolute temperature, and can be expressed by the equation – S = [(0.19 × 10 3/ T) + 0.25] mV/K. The heat of transport ( q ∗) of Ag + ion i.e. 0.19 eV is nearly equal to the activation energy ( Eσ) i.e. 0.20 eV of Ag + ion migration calculated from the conductivity plots indicating that the material has an average structure. This is also in consonance with earlier theories on heat of transport of ions in ionic solids.