Abstract
Dielectric dispersion studies have been carried out on the pentakis(imidazolium) undecabromodiantimonate(III),(C3N2H5)5Sb2Br11, single crystal in the audio-frequency region. It is found thatlow-frequency dielectric dispersion, observed for the field along thea-axis of the monoclinicsymmetry (P 21/n), reveals a polydispersive nature near the paraelectric–ferroelectric phase transition temperature(Tc = 145 K). The dielectric dispersion results can be fitted with the Cole–Cole formula.Unexpectedly, the mean relaxation frequency obeys the Vogel–Fulcher law with freezingtemperature of 143 K. Near the ferroelectric phase transition temperature, the process ofdielectric critical slowing down was observed. Such a dynamic dielectric response ischaracteristic of ferroelectrics with an ‘order–disorder’ transition mechanism.
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