Directional growth of organic- NLO crystal by different growth methods: A comparative study by means of XRD, HRXRD and laser damage threshold

M. , Arivanandhan and Xinming , Huang and Uda, Satoshi and G. , Bhagavannarayana and N. , Vijayan and K. , Sankaranarayanan and P. , Ramasamy (2008) Directional growth of organic- NLO crystal by different growth methods: A comparative study by means of XRD, HRXRD and laser damage threshold. Journal of Crystal Growth, 310 (21). pp. 4587-4592. ISSN 0022-0248

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Official URL: http://dx.doi.org/10.1016/j.jcrysgro.2008.08.036

Abstract

Unidirectional benzophenone single crystals grown by vertical Bridgman (VB), microtube-Czochralski (μT-CZ), uniaxially solution crystallization method of Sankaranarayanan–Ramasamy (SR) were characterized using X-ray diffraction (XRD), high-resolution XRD (HRXRD), laser damage threshold (LDT) studies and the results were compared. The XRD study exhibits the growth direction of the benzophenone crystal ingots. The HRXRD curves recorded by multicrystal X-ray diffractometer (MCD) revealed that the crystals grown by all the three methods contain internal structural grain boundaries. The SR grown sample shows relatively good crystalline nature with the full-width half-maximum (FWHM) of the main peak of 39 arcsec. While, the VB grown crystal contain multiple low-angle (α⩾1 arcmin) grain boundaries, probably due to thermal stress during post-growth annealing caused by the difference in the lattice expansion coefficients of the crystal and the ampoule, whereas such thermal stress are absent in μT-CZ grown sample due to the free standing nature of the grown crystal. Hence, the μT-CZ grown crystals contain only one very low-angle (α<1 arcmin) grain boundary. LDT study shows that the SR grown benzophenone crystal has higher LDT than the samples grown by other methods, probably due to relatively high-crystalline perfection of the SR grown crystals.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/S Elsevier B.V.
Uncontrolled Keywords:	A1. X-ray diffraction; A2. Growth from solutions; A2. Growth from melt; B2. Nonlinear optical materials
Subjects:	Crystallography Materials Science Physics
Divisions:	UNSPECIFIED
Depositing User:	Ms Neetu Chandra
Date Deposited:	23 Jul 2013 08:27
Last Modified:	23 Jul 2013 08:27
URI:	http://npl.csircentral.net/id/eprint/980

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