Influence of Urea in the Structural, Thermal and Dielectric Studies of L- Histidine Bromide (LHB) Single Crystals

S.E.Joema

Single crystals of pure and urea doped L-histidine bromide (LHB) were grown by isothermal slow evaporation technique. The zwitterionic nature of L-histidine leads to the formation of many crystals when organic and inorganic additives are added. Even though pure and urea doped LHB crystallize in non-centro symmetric from, it exhibits SHG efficiency and chemical stability. Single crystal X-ray diffraction studies were carried out to confirm the grown crystals and found that grown crystals crystallize in orthorhombic structure. Fourier Transform Infrared (FTIR) spectral analysis was performed to confirm the group ligands on the sample. Thermal stability has been analyzed using TG/DTA studies. The dielectric constant and dielectric loss of the crystal studied as a function of frequencies and also at room temperature and the results of there experiments are discussed.