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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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Chang et al. (2002) studied this question.
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