Abstract
Abstract TGS was grown by a slow cooling technique adding several kinds of dopants (10 and 20 mole% alanine, 10% alanine + LiVO3, 10% and 20% valine) to an aqueous solution. The temperature dependent pyroelectric coefficient, p and the spontaneous polarization, Ps, of doped-TGS crystals were measured to study the transition temperature, Pmax and room temperature pyroelectric coefficient depending on the dopants and to calculate the figure of merit, (p/K), (K is a dielectric constant). Furthermore, several pieces were selected to investigate the positional inhomogeneities of the same sample. Moderate figure of merit (p/K) was obtained in valine doped TGS because of low temperature dielectric relaxation around −10°C, although valine doped TGS has a three times higher pyroelectric coefficient (p = 1.671μC/cm2K) at transition temperature (Tc) than that of alanine doped TGS.
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