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Studies of solubility, metastable zone width, crystal growth morphology, mechanical and optical properties of UNBA NLO materials in different solvents

RamaNand Rai 1,  Chung-Wen Lan 2

1. Banaras Hindu University, Varanasi 221005, India
2. Department of Chemical Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei city 10617, Taiwan

Abstract
The transparent single crystals of organic nonlinear optical (NLO) urea-m.nitrobenzoic acid, UNBA, material have been grown from methanol, acetone and ethanol solvents. The solubility and metastable zone width (solution stability) of UNBA have been studied in different solvents at different particular temperatures. Applying the van’t Hoff equation the enthalpy, entropy and Jackson’s roughness parameters were computed from the saturation temperature for each solvent. The deviation from ideal behavior of different solutions were assessed using the enthalpy of solution, determined applying van’t Hoff equation, to that of heat of fusion value determined via differential scanning calorimeter (DSC). The temperature range of solution stability of different solution saturated at different particular temperature and optimum conditions to grow the good quality crystals from different solvents were studied. The crystals’ habits of grown crystals from different solvents were found to be solvent dependence. The Optical transmittance, mechanical stability, band gap and refractive index of crystals grown from different solvents were also studied.

PACS: 47.70.M; 31.70.D; 42.25B; 64.75

Key word: Solubility; Metastable zone width; van Haff equation; pH measurements; 

     Solution crystal growth; Optical Transmittance; Band gap

*Corresponding author: E-mail:[email protected]

 

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Presentation: Oral at 17th International Conference on Crystal Growth and Epitaxy - ICCGE-17, General Session 2, by RamaNand Rai
See On-line Journal of 17th International Conference on Crystal Growth and Epitaxy - ICCGE-17

Submitted: 2013-04-15 14:55
Revised:   2013-07-23 12:49