Dynamical heterogeneity of NaNO2 confined within porous glasses

Frequency dependences of imaginary part of the dielectric response ε'(f) of SiO2–NaNO2 nanocomposite, prepared by embedding of sodium nitrite into porous glasses with 7 nm average pore diameter, have been studied within a temperature range of 360–520 K. It has been found that the spectrum S(ω) = ε'(f)/f contains the component ~1/fα, where α is a coefficient indicating the dynamical heterogeneity of dipoles. Peculiarities of the temperature dependence of α are discussed.