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Structural, Optical, Mechanical and Laser Damage Threshold Studies on an active Nonlinear Optical Material: Potassium Thiourea Bromide (KTB) in a Novel Crystal System
摘要： The enhancement of optical transparency, crystalline perfection, laser damage threshold values and principally, mechanical strength of thiourea doped potassium bromide crystals grown under slow evaporation solution growth technique were assessed. The validation and morphology were done by X-ray diffraction analysis. The sample KTB crystallized in orthorhombic system is unique and novel. The vibrational range in the FT-IR affirmed the functional groups present in the title compound. The energy gap Eg found to be 4.12eV with broad transparency window between 300.600nm to 1100nm. Second harmonic studies manifest the suitability of the crystal for frequency conversion and doubling applications. The positive photo conducting nature of the material aspires that the sample would be more electrically conductive on the absorption of electromagnetic radiation. The laser damage threshold value indicates the aptness of the sample to confront against high power intensities. The elastic(C11), plastic, fracture traits(Kc) along with the yield strength(σv) and brittleness index(Bi) were calculated and reported for the first time under orthorhombic system. The result also evident appreciable mechanical strength of the crystal, as it holds cardinal importance in technological applications.
关键词： Crystal growth,Mechanical properties,Non linear optical material,Characterization,LDT,Photoconductivity
更新于2025-09-11 14:15:04
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Growth and Characterization of New Semi-Organic L-Asparagine Potassium Di-Hydrogen Phosphate Crystals
摘要： The studies on the growth and characterization of a new semi-organic non-linear optical crystal, L-asparagine potassium dihydrogen phosphate have been successfully carried out by slow evaporation technique using deionized water as a solvent. The grown crystal is characterized by powder X-ray diffraction analysis and FT-IR analysis. The results of X-ray diffraction analysis showed that it possess orthogonal structure having lattice parameters a = 5.582 ?, b = 9.812 ? and c = 11.796 ?, α = β = γ = 90° and V = 514 ?3. The fourier transform infrared spectroscopy of L-asparagine potassium dihydrogen phosphate crystal were recorded between wave-number 4000 to 400 cm–1 showed very weak bands appearing around 1232 and 1147 cm–1 are due to P–O–H stretching and bending. The observed broad intense band in 3385-3119 cm–1 region is assigned to NH stretch of NH2 vibration of L-asparagine potassium dihydrogen phosphate molecule. The CH2 vibration of the amino acid shows its peak at 2945 cm–1. The combination band observed at 2149 cm–1 is due to + tensional oscillation at 512 cm–1 and optical transmission spectral analysis. The lower asymmetric NH3 cut off wavelength of L-asparagine potassium dihydrogen phosphate crystal occurs at 198 nm and it reveals that the material has good optical transparency in the entire visible region. The results of hardness test showed that the presence of dopant has enhanced the mechanical strength of the L-asparagine potassium dihydrogen phosphate crystals and the second harmonic generation of L-asparagine potassium dihydrogen phosphate crystals was tested using Kurtz and Perry method also showed good results.
关键词： Non-linear optical material,Characterization,Second harmonic generation,Slow evaporation technique
更新于2025-09-09 09:28:46