Effect of Nanosized Oxides on Structural and Dynamic Properties of Composites Based on LiClO4

Structural and dynamic properties of the composites based on lithium perchlorate LiClO 4 at various temperatures, phase states, and concentrations of the inert fillers SiO 2 and Al 2 O 3 were studied by Raman scattering (RS) and differential thermal analysis (DTA). It was shown that an amorphous phase formed in the (1 – х )LiClO 4 + x SiO 2 and (1 – х )LiClO 4 + x Al 2 O 3 composites (for x ≥ 0.4), its thermal effect was recorded at 200°С. In the Raman spectrum of the heterogeneous system, in the frequency range corresponding to totally symmetric vibration of the perchlorate anion, an additional component with a Raman maximum at ∼ 954 cm –1 , which could be attributed to an amorphous phase, was also revealed. While the filler concentration increased, the values of enthalpies of phase transitions decreased monotonically, and at x = 0.8, both spectral and thermophysical manifestations of phase transitions completely disappeared. Doping of lithium perchlorate with silicon and aluminum oxides led to an increase in ionic conductivity. The maximum values of conductivity were observed for the 0.4LiClO 4 + 0.6SiO 2 and 0.5LiClO 4 + 0.5Al 2 O 3 composites.