Solutal convection during growth of organic NLO crystals

• Published in: Progress in crystal growth and characterization of materials Vol. 44; no. 3; pp. 169 - 174
• Main Authors: Singh, N.B., Singh, O.P., Singh, N.P., Singh, Namwar, Singh, Y.P., Singh, Narsingh Bahadur
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Oxford Elsevier Ltd 2002; Elsevier
• Subjects: Convection; Cross-disciplinary physics: materials science; rheology; Crystal; Exact sciences and technology; Growth from melts; zone melting and refining; m. Nitroaniline and m.Dinitrobenzene; Materials science; Methods of crystal growth; physics of crystal growth; Organic; Physics; Solidification; Theory and models of crystal growth; physics of crystal growth, crystal morphology and orientation; m. Nitroaniline and m.Dinitrobenzene; Organic; Convection; Solidification; Crystal; Liquid solid interface; Amines; Directional solidification; Temperature gradients; Growth interface; Nitro compounds; Binary systems; Experimental study; Fabrication property relation; Morphology; Benzenic compound; Optical materials; Nonlinear optics; Bridgman method; Organic compounds; Crystal growth from melts
• ISSN: 0960-8974; 1878-4208
• DOI: 10.1016/S0960-8974(02)00014-1

Effect of solutal and thermal convection plays very important role when a large thermal gradient is applied during crystal growth. To address this problem, we have purified m.nitroaniline (m.NA) and m. dinitrobenzene (m.DNB) and studied crystal growth and effect of growth parameters on the optical quality. Crystals of pure and binary alloy of m.dinitrobenzene and m.nitroaniline were grown by vertical directional solidification method in a two zone transparent furnace. Effect of doping and temperature gradient on the solid-liquid interface morphology and quality of crystal was determined by studying the bulk transparency and nonlinearity.