The temperature dependence of electrical conduction was studied and the activation energy was calculated for crystals with long hydrogen bonds, viz., lithium, yttrium, holmium, and erbium formates, urea and thiourea. A weak pyroelectric effect was revealed in the urea crystal at a temperature below room temperature. At temperatures below the phase transition temperature ($Т_С$ = 169 K) in weak electric fields, the thiourea crystal showed anomalies associated with a change in the behavior of protons on hydrogen bonds.
Department of General Physics and Wave Processes, Faculty of Physics, Moscow State University, Leninskie Gory, Moscow, 119992, Russia
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