Abstract
Abstract Pyroelectric properties of triglycine sulphate (TGS) single crystals doped with Co, Cu, and Tl ions were studied. In crystals containing less than 5 × 10−5 wt% of impurities, an increase of pyroelectric coefficient and magnitude of reorienting polarization is observed as compared with those in pure TGS. Larger doping concentrations lead to decrease of these parameters. Anomalous pyroelectric hysteresis loops are observed in some cases. Thermal Barkhausen effect (TBE) was also studied. On this basis it was found that the temperature of most intense depoling drops for doped TGS crystals in comparison with pure ones. The nature of observed concentration dependence of pyroelectric properties is interpreted on the same ground as the radiation-induced changes in ferroelectric properties. TBE is analyzed in terms of depolarizing fields of bounded charges, occurring due to temperature gradients in the crystal.
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