Audio and subaudio dielectric dispersion in Deuterated Triglycine Sulphate

Abstract

Abstract Experimental values are reported for the complex dielectric permittivity, ϵ (ω), of single crystal Deuterated Triglycine Sulphate (DTGS) at temperatures on both sides of the ferroelectric Curie temperature Tc, covering the audio and subaudio frequency range, (102 to 105 and 10−4 to 1 Hz). In the audio frequency range, in contrast with the strong typical ferroelectric dispersion in the GHz region, the dielectric losses and the real part of the susceptibility X (ω) = ϵ (ω) - ϵ∞ follow the empirical relation X″ (ω) ∼ ωn-1 which gives a frequency independient ratio, according to the Jonscher universal law for the dielectric response X″/X′ = cot (nII/2). However, in the subaudio frequency region we find that the dielectric loss fits the empirical relation X″ (ω) ∼ ω when ω → 0. The experimental results are discussed.