Sivakumar, N. and Kanagathara, N. and Bhagavannarayana, G. and Kalainathan, S. and Anbalagan, G. (2015) Growth, crystalline perfection, optical, thermal, laser damage threshold and electrical characterization of melaminium levulinate monohydrate single crystal. Journal of Crystal Growth, 46. pp. 86-94. ISSN 0022-0248

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Abstract

Equimolar amounts of melamine and levulinic acid results an organic crystal of melaminium levulinate monohydrate (MLM) at room temperature. MLM belongs to a monoclinic crystal structure having P2(1)/c space group which was confirmed by single crystal X-ray diffraction study. Functional groups present in the MLM crystal were identified by FT-IR spectral study. HRXRD study dictates the quality of MLM crystal. UV-visble spectrum of MLM reveals the lower cut-off wavelength of 293 nm with 55% optical transparency and optical band gap was found to be 4.20 eV for the prominent plane (1 0-1). Refractive indices for the three axes of MLM crystal were found to be n(x)=2.6, n(y)=2.4 and n(z)=2.2 respectively. Further the thermal stability and melting point of MLM crystal were investigated by TG/DTA study. Dielectric permittivity tensor components were estimated for the planes (1 0 - 1), (0 1 0) and (1 1 1) respectively. The thermal conductivity of the crystal by Wiedemann-Franz law was found to be 5.99 x 10(-11) W/mK at 70 degrees C. LDT value (2.84 GW/cm(2)) of MLM was estimated for laser optical device applications. (C) 2015 Elsevier B.V. All rights reserved.

Item Type:	Article
Uncontrolled Keywords:	Crystalmorphology HighresolutionX-raydiffraction Growthfromsolutions Organiccompounds Dielectricmaterials
Subjects:	Crystallography Materials Science Applied Physics/Condensed Matter
Divisions:	UNSPECIFIED
Depositing User:	Dr. Rajpal Walke
Date Deposited:	23 Sep 2016 07:29
Last Modified:	23 Sep 2016 07:29
URI:	http://npl.csircentral.net/id/eprint/1844

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