A Study on Structural, Optical, Electrical and Etching Characteristics of Pure and L-Alanine Doped Potassium Dihydrogen Phosphate Crystals

Ferdousi Akhtar, Jiban Podder

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DOI: 10.4236/jcpt.2011.13009                

Abstract

Pure potassium dihydrogen phosphate (KDP) crystals and KDP doped with L-alanine have been grown by slow evaporation technique at room temperature. Grown crystals have been characterized using powder X-ray diffraction, (XRD), Energy Dispersive X-ray spectroscopy (EDX) and Fourier Transform Infrared spectroscopy (FTIR). The presence of L-alanine into pure KDP crystal was confirmed by FTIR and EDX spectra. Crystal structure has been studied by XRD. Pure KDP and L-alanine doped KDP crystals both possessed tetragonal structure. The transparency is found to increase with the increase of doping concentrations of the grown crystals as observed by UV-Vis spectra. A.C. electrical conductivity of grown crystals along the growth axis was carried out at various temperatures ranging from 35?C - 400?C. Dielectric constant and dielectric losses are measured as a function of temperature and this study reveals the contribution of space charge polarization. Crystal defects and surface morphology are studied by dissolution solvent technique and reveals the step growth mechanism for both pure and doped crystals.

Keywords

Amino Acid, KDP, Solution Growth, FT-IR, Electrical Conductivity, Etch Pits

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	X. Sun, X. Xu, Z. Gao, Y. Fu, S. Wang, H. Zeng and Y. Li, “Effect of EDTA on the Light Scatter in KDP Crys-tals,” Journal of Crystal Growth, Vol. 217, 2000, pp. 404-409.
[2]	N. Zaitseva, L. Carman, and I. Smolsky, “Habit Control during Rapid Growth of KDP and DKDP Crystals,” Journal of Crystal Growth, Vol. 241, No. 3, 2002, pp. 363-373. doi:10.1016/S0022-0248(02)01244-7
[3]	R. W. G. Wyckoff, “Crystal Structure,” 2nd Edition, In-terscience, New York, 1960.
[4]	J. Podder, “The Study of Impurities Effect on the Growth and Nucleation Kinetics of Potassium Dihydrogen Phos-phate,” Journal of Crystal Growth, Vol. 237-239, 2002, pp. 70-75. doi:10.1016/S0022-0248(01)01854-1
[5]	G. G. Muley, M. N. Rode and B. H. Pawar, “FT-IR, Thermal and NLO Studies on Amino Acid (L-Arginine and L-Alanine) Doped KDP Crystals,” Acta Physica Po-lonica A, Vol. 116, 2009, pp. 1033-1038.
[6]	B. Suresh Kumar and K. Rajendra Babu, “Effect of L-Arginine, L-Histidine and Glycine on the Growth of KDP Single Crystals and Their Characterization,” Indian Journal of Pure and Applied Physics, Vol. 46, No. 2, 2008, pp. 123-126.
[7]	S. Gunasekaran and G. R. Ramkumaar, “Analysis on Suitability of Pure and α-Histidine Doped KDP Crystals in High Speed Applications,” Indian Journal of Physics, Vol. 83, No. 11, 2009, pp. 1549-1555. doi:10.1007/s12648-009-0138-4
[8]	K. D. Parikh, D. J. Dave, B. B. Parekh and M. J. Joshi, “Growth and Characterization of L-Alanine Doped KDP Crystals,” Crystal Research and Technology, Vol. 45, No. 6, 2010, pp. 603-610. doi:10.1002/crat.201000019
[9]	M. Priya, C. M. Padma, T. H. Freeda, C. Mahadevan and C. Balasingh, “Electrical Conductivity Measurements on Gel Grown KDP Crystals Added with Urea and Thiou-rea,” Bulletin of Material Science, Vol. 24, No. 5, 2001, pp. 511-514. doi:10.1007/BF02706723
[10]	P. Kumaresan, S. Moorthy Babu and P. M. Anbarasan “Influence of Dopants (L-Glutamic Acid, L-Histidine and L-Valine) on the Performance of KDP Crystals,” 4th DAE-BRNS Laser Symposium, Vol. 4, 2005, pp. 521-522.
[11]	P. Kumaresan, B. S. Moorthy Babu and P. M. Anbarasan, “Thermal Dielectric Studies on Pure and Amino Acid (L-Glutamine, L-Histadine, L-Valine) Doped KDP Single Crystals,” Optical Materials, Vol. 30, No. 9, 2001-1368. doi:10.1016/j.optmat.2007.07.002
[12]	K. D. Parikh, D. J. Dave, B. B. Parekh and M. J. Joshi, “Thermal, FT-IR and SHG Efficiency Studies of L-Arginine Doped KDP Crystals,” Bulletin of Material Science, Vol. 30, No. 2, 2007, pp. 105-112. doi:10.1007/s12034-007-0019-4
[13]	P. Kumaresan, B. S. Moorthy Babu and P. M. Anbarasan, “Effect of Metal Ion and Amino Acid Doping on the Optical Performance of KDP Single Crystals,” Journal of Optoelectronics and Advanced Materials, Vol. 1, No. 2, 2007, pp. 65-69.
[14]	A. Anne Assencia and C. Mahadevan, “D.C. Electrical Conductivity Measurements on ADP Single Crystals Added with Simple Organic Compounds,” Bulletin of Material Science, Vol. 28, No. 5, 2005, pp. 415-418. doi:10.1007/BF02711229
[15]	J. D. Bernal, “The Crystal Structure of the Natural Amino Acids and Related Compounds,” Zeitschrift für Kristal-lographie, Vol. 78, 1931, pp. 363-369.
[16]	H. J. Simpson Jr. and R. E. Marsh, “The Crystal Structure of L-Alanine,” Acta Crystallographica, Vol. 20, 1966, pp. 550-555. doi:10.1107/S0365110X66001221
[17]	R. Destro, R. E. Marsh and R. Bianchi, “A Low Temper-ature (23K) Study of L-alanine,” The Journal of Physical Chemistry, Vol. 92, 1988, pp. 966-973. doi:10.1021/j100315a022
[18]	L. Misoguti, A. T. Varela, F. D. Nunes, V. S. Bagnato, F. E. A. Melo, J. Mendes Filho and S. C. Zilio, “Optical Properties of L-Alanine Organic Crystals,” Optical Mate-rials, Vol. 6, No. 3, 1996, pp. 147-152. doi:10.1016/0925-3467(96)00032-8
[19]	N. Vijayan, S. Rajasekaran, G. Bhagavannarayana, R. Ramesh Babu, R. Gopalakrishnan, M. Palanichamy and P. Ramasamy, “Growth and Characterization of Nonlinear Optical Amino Acid Single Crystal: L-Alanine,” Crystal Growth & Design, Vol. 6, No. 11, 2006, pp. 2441-2445. doi:10.1021/cg049594y 8, pp. 136
[20]	L. B. Harris and G. J. Vella, “Conductivity of Single Crystals of Potassium Dihydrogen Phosphate,” Journal of Applied Physics, Vol. 37, No. 11, 1967, pp. 4294-4294.
[21]	K. Sangwal and R. B. Heimann, “Etching of Crystals: Theory, Experiments and Applications,” North Holland, Amsterdam, 1987.
[22]	K. Sangwal and I. Owczarek, “On the Formation of Etch Grooves at Impurity Striations and Growth Sector Boun-daries in Crystals Grown from Solutions,” Journal of Crystal Growth, Vol. 129, No. 3-4, 1993, pp. 640-652. doi:10.1016/0022-0248(93)90500-V