Modification of pyroelectric crystal TGS using thermodynamic theory

Based on the Devonshire thermodynamic theory, the relationship lambda/chi = Ps/C can be regarded as a method to increase the pyroelectric material fig ure of merit of ferroelectric crystals. Several modified TGS crystals doped with urea or co-doped with urea and other dopants have been grown. The eff ect of the urea dopant on crystal growth and pyroelectric properties was in vestigated. The pyroelectric figures of merit M (lambda/epsilon) of the dop ed TGS crystals are obviously higher than those of pure TGS. Furthermore, t he variations of lambda/chi and Ps/C as a function of temperature for these doped TGS single crystals were measured, and analyzed according to the Dev onshire thermodynamic model.