Characterization and Characteristics of mechanochemically synthesized amorphous fast ionic conductor 50 SISOMO (50AgI-25Ag2O-25MoO3)

TL;DR

This study reports on the synthesis of amorphous 50SISOMO fast ionic conductor with high room-temperature ionic conductivity, thermal stability, and detailed thermoelectric properties, demonstrating its potential for energy applications.

Contribution

It presents a novel mechanochemical synthesis method for amorphous 50SISOMO with significantly enhanced ionic conductivity and stability, along with thermoelectric characterization.

Findings

Ionic conductivity of ~6x10^-3 Ω^-1 cm^-1 at room temperature.

Thermal stability up to ~70°C.

Linear thermoelectric power variation with inverse temperature.

Abstract

Mechanochemically synthesized amorphous 50SISOMO [50AgI-25Ag_2O-25MoO_3] fast ionic conductor shows high ionic conductivity of ~ 6x10^-3 {\Omega}^-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 than that of crystalline AgI at room temperature. The samples are thermally stable at least up to ~70 {\deg}C. Thermoelectric power studies on 50 SISOMO amorphous fast ionic conductors (a-SIC) have been carried out in the temperature range 300-330K. 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 \times 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 (E) 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 heats of transport of ions in ionic solids.