Growth and structural, spectral, optical characterization of pure, ammonium dihydrogen phosphate (ADP) and tartaric acid doped triglycine sulphate (TGS) single crystals

Abstract: Ferroelectric crystals are interesting class of materials. They are similar to ferromagnetic materials in that, they exhibit hysteresis loops, spontaneous polarization and coercive field. Ferroelectric crystals have a number of practical applications and one of those is a pyroelectric infrared (PIR) detection. PIR devices can detect a person moving into or through a detection zone with high reliability. The slightest positive or negative thermal radiation change in contrast to a background, focused by the appropriate optics, triggers the sensor element. There is no interference between neighbouring units due to the passive nature of the detection principle. At the heart of every PIR detector is the pyroelectric crystal. The detectors use materials, such as triglycine sulfate (TGS) or lithium tantalite.In the present work, ADP and tartaric acid were employed as dopants. The grown crystals were subjected to different characterization studies inorder to study the properties of the TGS crystal. The results are discussed in this paper