Optical, thermal, dielectric and mechanical studies on glycine doped potassium dihydrogen orthophosphate singles crystals grown by SR method
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Publication Details
Author list: Pattanaboonmee N., Ramasamy P., Manyum P.
Publisher: Elsevier
Publication year: 2012
Volume number: 32
Start page: 1019
End page: 1025
Number of pages: 7
ISSN: 1877-7058
Languages: English-Great Britain (EN-GB)
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Abstract
Single crystals of glycine doped potassium dihydrogen orthophosphate (KDP) were grown by Sankaranarayanan- Ramasamy (SR) method with have a size of 20 mm in diameter and 90 mm in length. The grown crystals were subjected to powder X-ray diffraction (XRD), differential scanning calorimeter (DSC), thermo-gravimetric analysis (TGA), optical transmission, dielectric and Vickers microhardness studies. The TGA of the samples reveal that the grown crystals were stable up to 200 ฐC at least for all samples. The important optical parameters such as reflection and extinction coefficients of the grown crystal were calculated and discussed. The variation of dielectric constant, dielectric loss, a.c. resistivity and a.c. conductivity with frequency of applied field in the range from 1 kHz to 200 kHz was studied. The lower values of dielectric loss due to less of defect were observed in SR grown glycine doped KDP crystals. Vickers microhardness study shows higher mechanical stability in SR method grown crystals. ฉ 2010 Published by Elsevier Ltd.
Keywords
Dielectric materials, Growth from solutions, Nonlinear optical materials
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