Dielectric studies in solid phase MBBA

Abstract

Dielectric measurements have been made in the metastable solid phase of MBBA in the frequency range 1–100 kHz and in the temperature range −196 to 0°C. The results indicate a Debye‐type dispersion with symmetric distribution of relaxation times. The dielectric relaxation strength (Δε=ε₀−ε_∞) varies with temperature and shows a maxima at about −60°C. The results can be qualitatively explained by assuming the free rotation of the dipoles in the temperature range above −60°C and a restricted rotation of the dipoles (or restricted number of active dipoles) in the low temperature region.