Abstract
Based on the Devonshire thermodynamic theory, the relationship λ χ = Ps/C can be regarded as a method to increase the pyroelectric material figure of merit of ferroelectric crystals. Several modified TGS crystals doped with urea or co-doped with urea and other dopants have been grown. The effect of the urea dopant on crystal growth and pyroelectric properties was investigated. The pyroelectric figures of merit M ( λ ϵ ) of the doped TGS crystals are obviously higher than those of pure TGS. Furthermore, the variations of λ χ and Ps/C as a function of temperature for these doped TGS single crystals were measured, and analyzed according to the Devonshire thermodynamic model.
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