JCPT  Vol.1 No.2 , July 2011
Structural, Optical, Electrical and Thermal Characterizations of Pure and L-alanine Doped Ammonium Dihydrogen Phosphate Crystals
ABSTRACT
Pure ammonium diyidrogen phosphate and L-alanine doped ammonium diyidrogen phosphate crystals were grown from aqueous solutions by natural evaporation process. The grown crystals are characterized by Fourier Transform Infrared spectroscopy, Energy Dispersive X-ray, UV-visible spectroscopy and differential thermal analysis. Crystal structure has been studied by powder X-ray diffraction. Pure and doped crystals both possessed tetragonal structure. The optical transparency is found to increase with the increase of doping concentration in the grown crystals and band gap energies of all crystals have been calculated at their cut off frequencies. It is found that the optical band gap increases with doping concentrations. D.C.electrical conductivity of grown crystals along the growth axis was carried out at temperatures ranging from 35-140°C by the conventional two-probe method. The conductivity of the crystals increases with temperature and also increases with the L-alanine concentration. The decomposition temperatures and weight loss have been estimated from the Thermo Gravimetric Analysis and Differential Thermal Analysis and hardness was found from the Vicker’s microhardness measurement.

Cite this paper
nullF. Akhtar and J. Podder, "Structural, Optical, Electrical and Thermal Characterizations of Pure and L-alanine Doped Ammonium Dihydrogen Phosphate Crystals," Journal of Crystallization Process and Technology, Vol. 1 No. 2, 2011, pp. 18-25. doi: 10.4236/jcpt.2011.12004.
References
[1]   S. R. Marder, B. G. Tiemann, J. W. Perry, et al., “Materials for Non-linear Optics Chemical Perspectives,” American Chemical Society, Washington, 1991, p. 280.

[2]   H. M. Muncheryan, “Lasers and Opto-Electronics Devices,” Hemisphere Pub. Co, New York 1991.

[3]   Y. R. Shen, “The Principles of the Nonlinear Optics,” Wiley, New York 1984.

[4]   P. Meystrey and M. Sargent, “Elements of Quantum Optics,” Springe-Verlag, Berlin, 1991.

[5]   J.-I. Sakai, “Phase Conjugate Optics,” McGraw Hill, Inc., New York, London, 1992.

[6]   P. Ramasamy and P. Santhana Raghavan, “Crystal Growth Processes and Methods,” KRU Publications, Kumbakonam, 1999.

[7]   P. Santhana Raghavan and P. Ramasamy, “Recent Trends in Cyrstal Growth,” Pinsa 68, New Delhi, 2002, p.235.

[8]   L. F. Warren, “New Development in Semiorganic Non-linear Optical Crystals,” In R. E. Allred, R. J. Martinez and W. D. Wischmann, Ed., Electronic Materials, The proceedings of the Fourth International SAMPE Electronics Conference, Vol. 4, June 12-14, 1990, Covina, pp. 388-396.

[9]   J. F. Nicoud and R. J. Twieg, “Design and Synthesis of Organic Molecular Compounds for Efficienty Second Harmonic Generation,” In: D. S. Chemla and J. Zyss, Ed., Nonlinear Optical Properties of Organic Molecules and Crystals, Academic, Orlando, 1986, Vol. 1.

[10]   A. Jayarama and S. M. Dharmaprakash, “Structural Distortion in Thiourea-Mixed ADP Crystals,” Applied Surface Science, Vol. 253, No. 2, 15 November 2006, pp. 944-949. doi:10.1016/j.apsusc.2006.01.051

[11]   J. D. Bernal, “The Crystal Structure of the Natural Amino Acids and Related Compounds,” Z. Kristallogr, Vol. 78, 1931, pp. 363-369. www.Shodhganga.inflibnet.ac.in/bitstream/10603/41/14/references

[12]   H. J. Simpson Jr. and R. E. Marsh, “The Crystal Structure of L-alanine,” Acta Crystallographica, Vol. 20, Part 4, April 1966, pp. 550-555. doi:10.1107/S0365110X66001221

[13]   R. Destro, R. E. Marsh and R. Bianchi, “A Low Temperature (23K) Study of L-alanine,” The Journal of Physical Chemistry, Vol. 92, 1988, pp. 966-973. doi:10.1021/j100315a022

[14]   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 Materials, Vol. 6, 1996, pp. 147-152. doi:10.1016/0925-3467(96)00032-8

[15]   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

[16]   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:10.1021/cg049594y

[17]   D. L. Xu and D. F. Xue,” Chemical Bond Analysis of the Crystal Growth of KDP and ADP,” Journal of Crystal Growth, Vol. 286, No. 1, 1 January 2006, pp. 108-113. doi:10.1016/j.jcrysgro.2005.09.040

[18]   N. P. Rajesh, V. Kannan, P. Santhana Raghavan, P. Ramasamy and C. W. Lan, “Nucleation Studies and Crystal Growth of (NH4)H2PO4 Doped with Thiourea in Supersaturated Aqueous Solutions”, Materials Chemistry and Physics, Vol. 76, No. 2, pp. 181-186, 15 August 2002. doi:10.1016/j.jcrysgro.2005.09.040

[19]   J. W. Mullin and A. Amatavivadhana,” Growth Kinetics of Ammonium and Potassium Dihydrogen Phosphate Crystals,” Journal of Applied Chemistry, Vol. 17, No. 5, May 1967, pp. 151-156. doi:10.1002/jctb.5010170508

[20]   P. Rajesh and P. Ramasamy, “A Study on Optical, Thermal, Mechanical, Dielectric, Piezoelectric and NLO Properties of Unidirectional Ammonium Chloride Added Ammonium Dihydrogen Phosphate Crystal,” Materials Letters, Vol. 63, No. 26, 31 October 2009, pp. 2260-2262. doi:10.1016/j.matlet.2009.07.018

[21]   P. V. Dhanaraj, G. Bhagavannarayana and N. P. Rajesh, “ Effect of Amino Acid Additives on Crystal Growth Parameters and Properties of Ammonium Dihydrogen Orthophosphate Crystals,” Materials Chemistry and Physics, Vol. 112, No. 2, 1 December 2008, pp. 490-495. doi:10.1016/j.matchemphys.2008.06.003

[22]   M. Meena and C. K. Mahadevan, “Growth and Electrical Characterization of L-arginine Added KDP and ADP Single Crystals,” Crystal Research and Technology, 43, No. 2, 2008, pp.166-172. doi:10.1002/crat.200711064

[23]   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. 603, 2010, pp. 1-8.

[24]   B. Suresh Kumar, M. R. Sudarsana Kumar and K. Bajendra Babu, “Growth and Characterization of Pure and Lithium Doped L-alanine Single Crystals for NLO Devices,” Crystal Research and Technology, Vol. 43, No. 7, 2008, pp.745-750. doi:10.1002/crat.200711064

[25]   M. Priya, C. M. Padma, T. H. Freead, C. Mahadevan and C. Balasingh, “Electrical Conductivity Measurements on Gel Grown KDP Crystals Added with Urea and Thiourea,” Bulletin of Material Science, Vol. 24, No. 5, 2001, pp. 511-514. doi:10.1007/BF02706723

[26]   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, April 2007, pp. 105-112. doi:10.1007/s12034-007-0019-4

 
 
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