GROWTH AND PROPERTIES OF UREA-DOPED TRIGLYCINE SULFATE (URTGS) CRYSTALS

This paper discusses the growth and properties of triglycine sulfate ( TGS) crystals doped with urea. It was found that the normalized growth yield and pyroelectric and dielectric constants could be increased si gnificantly by urea additions. TGS crystals doped with 5 and 10 wt% ur ea exhibited up to five times higher material figures of merit for inf rared pyroelectric detectors compared with undoped TGS crystals. The V ickers hardness of doped crystals increased with urea content to about three times the undoped value in the [010] direction at 10 wt% urea. No significant increase in the hardness was found, however, in the [00 1] direction. Incorporation of urea in TGS crystals has been qualitati vely estimated by Fourier transform infrared (FTIR) data.