Temperature and Phase Dependence of the Spectral and Molecular Relaxation Characteristics of (1 – x)RbNO3 + xAl2O3 Composites

Temperature and phase dependences of Raman spectra (RS) and molecular relaxation characteristics of nitrate-ion vibrations in (1 – x )RbNO 3 + x Al 2 O 3 composites with various concentrations of Al 2 O 3 nanopowder were studied. It was shown that the ν 1 ( A ) vibrational relaxation time with filler concentration x = 0.6 was essentially constant in high-temperature phase RbNO 3 -II as compared with RbNO 3 -III, which indicated that the cubic RbNO 3 -III phase was stabilized. The salt subsystem was highly disordered at high filler concentrations so that structurally distinct states were difficult to detect at the macro level.