GROWTH OF GLYCINE BARIUM NITRATE (GBN) CRYSTAL VIA SLOW EVAPORATION METHOD UNDER ELECTRIC FIELD EFFECT AND ITS NON-LINEAR OPTIC NATURE

• Main Author: Septian Eka Adistha Putra, Putu
• Format: Theses
• Language: Indonesia
• Subjects: Kimia
• Online Access: https://digilib.itb.ac.id/gdl/view/38232
• Institution: Institut Teknologi Bandung

Non-linear optical materials (NLO) have been studied recently in science and technology which are known can be applied in the field of telecommunications, optical information, and optical storage media. One of the NLO material that is recently developed is Glycine Barium Nitrate (GBN). GBN crystal has non -linear optical properties, one of them is Second Harmonic Generation (SHG). Single crystal of this compound have local dipole moments due to charge difference in zwitterion: +NH3 and COO-. In this research, GBN single crystals were grown by slow evaporation method is was accompanied by the application of an external electric field. The application of external electric field in crystal growth system is expected to align local dipole moments, therefore, it could be expected that it will increase the quality of the grown single crystal. GBN crystals were grown from their saturated solution with slow evaporation method in Pyrex glass tube (40 mm in diameter, 30 mm in height) that was connected with a high voltage power supply (15 kV). Crystal grew over a span of 16-28 days at 50 oC with a variation of electric field 0-5 kV/cm. Grown GBN single crystals has trapezoid-shaped, with an typical dimension of 5x4x3 mm3. GBN crystals grown with various electric field were characterized with X-Ray powder diffraction method and it was found that higher electric field can cause GBN diffraction peaks shifting to lower 2?. GBN adopt orthorhombic crystal lattice with space group P212121. Refinement analysis have been carried out with Le Bail Method using Fullprof program. Results of refinement indicated that lattice parameter a become longer, while b and c decreases along with the increasing of electric field application. The crystal lattice parameter a for GBN 0 kV / cm, 1 kV / cm, 2 kV / cm, 3 kV / cm, 4 kV / cm and 5 kV / cm are 8,2328 (3) Å; 8,2510 (2) Å; 8,2557 (1) Å; 8,2571 (1) Å; 8,2623 (2) Å; and 8,2574 (2) Å respectively. Measurement on the non-linear optical properties of GBN crystals is their SHG nature and it is known that GBN-4 crystal have the highest SHG efficiency.