Studies on triglycine sulphate crystals doped with nitroanilines

Single crystals of triglycine sulphate (TGS) doped with o-, p- and m-nitroanilines and L-alanine have been grown by the method of temperature lowering. Their dielectric permittivity and electrical conductivity have been studied as a function of temperature. The observed increase in the Curie temperature due to p-nitroaniline as dopant is only 1.5 degrees C but at the expense of a nine-fold reduction in the maximum value of the permittivity. It has been suggested that nitroanilines enter the TGS lattice interstitially, in contrast to L-alanine which substitutes in place of the glycine molecules.