Abstract
The problem of the existence of a new ferroelectric phase transition at low temperatures in triglycine sulphate (TGS) crystals is discussed. The influence of some inorganic divalent and trivalent ions presented in the lattice of TGS on dielectric and AC conduction is examined. The internal biasing field caused by the existence of dopants in TGS crystals is found to have an effect similar to the effect of an external biasing field working on the crystal. A small thermal hysteresis in the dielectric behaviour is detected at the transition temperature. The AC conductivity and the activation energy of conduction both change as a result of the existence of the distorted lattice caused by the dopants. The resemblance between the behaviour of the dielectric constant and that of the AC conductivity with temperature is quite noticeable.
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