Abstract
Hydrogen bonded molecular ferroelectric crystal diisopropylammonium bromide (dipaBr) were grown by slow evaporation of methanol, hydrobromic and hydrochloric acid solution. The ac conductivity and dielectric properties of the material are investigated in the frequency range 20 Hz–10 MHz in the ferroelectric phase. Frequency-dependent electrical and dielectric data have been discussed in the framework of a power law conductivity and complex dielectric permittivity. Doping induced dipaBr crystals possess spontaneous polarization much smaller than pristine dipaBr crystals and exhibits relaxaor ferroelectric type behaviour with weak dielectric relaxation behaviour. The associated activation energies obtained from dc and ac conductivity similar and satisfy the Barton-Nakajima-Namikawa (BNN) relation.
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