Ion transport study of mechanically-milled amorphous AgI-Ag₂O-V₂O₅ fast ionic conductors

Abstract

The structural and electrical characterizations of mechanically-milled (MM) amorphous fast ionic conductors (a-FICs), viz. xAgI (100-x)[0.67 Ag₂O-0.33V₂O₅] ( x = 40, 50, 55 and 70 ) have been reported. The amorphisation is restricted only to the compositions which are well within the glass forming region and all samples are found to be highly agglomerated and X-ray amorphous in nature. The frequency dependent ac conductivity , , of the amorphous samples investigated in the frequency range 5Hz -13 MHz and temperature range 100- 350 K shows a dc conductivity regime at low frequencies and a dispersive regime at higher frequencies. The spectra can be described by the Jonscher power law (JPL), However, the values σ dc(T) and A(T) both show two distinct Arrhenius regions and n ( < 1 ) is found to be temperature dependent, i.e., decreasing with increasing temperature.