Modified triglycine sulfate (TGS) single crystals have been grown from the aqueous solution by doping with urea, yttrium sulfate, L-serine + cobalt sulfate, and L-alanine + urea in the ferroelectric phase using a temperature lowering technique. The effects of these different dopants on the growth, dielectric, pyroelectric, optical, and mechanical properties have been investigated. TGS doped with urea and L-serine + cobalt sulfate exhibited higher material figures of merit for pyroelectric infrared detecting devices compared with pure TGS crystals. The Vicker's hardness studies at room temperature, carried out on ( 001) and (010) crystallographic planes using the Leitz Weitzler microhardness tester, show increased hardness of the doped crystals.
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