Vickers Micro-Hardness Studies of Amino Acids (L-Histidine, L-Threonien and DL-Methionine) Doped KDP Crystals

Abstract:

Pure and various amino acids (L-histidine, L-threonine, DL-methionine) doped KDP crystals were grown by slow solvent evaporation technique. The doping of amino acids was confirmed by C, H, N analysis, FTIR spectroscopy and paper chromatography .Pure and doped KDP crystals were subjected to Vickers microhardness studies. Indentations were made on smooth (100) as grown faces of pure and doped crystals. The Vickers indenter loads were varied from 0.298 N to 0.981 N in order to study the effect of load on microhardness. A number of indents were made at each load and the mean diagonal length (d) was used in calculating the Vickers Hardness Number (H_V). The Vickers micro-hardness decreased as amino acid doping level was increased indicating that the KDP crystals became softer after doping. The Indentation size effect (ISE) the Kicks law as well as PSR model was verified for all samples. The values of the load independent hardness and the Newtonian pressure (W) were higher in pure KDP crystals than the amino acids doped KDP crystals. It was found that as the doping concentration of amino acids increased the values of load independent hardness and Newtonian pressure decreased. Hays and Kendall law analysis was also applied to the hardness data.

• Periodical: Advanced Materials Research (Volume 665)
• Pages: 172-178
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.665.172
• Online since: February 2013
• Authors: Dipak J. Dave, Ketan D. Parikh, Mihir J. Joshi
• Keywords: Hays, ISE, Kendall Law, PSR Model, Vickers Microhardness

References

[1] N. P. Zaitseva, L. N. Rashkovich and S. V. Bogatyreva, Stability of KH2PO4 and K(H, D)2PO4 solutions at fast crystal growth rates, J. Cryst. Growth 148 (1995) 276-282.

DOI: 10.1016/0022-0248(94)00606-7

[2] C. W. Stillwel, Crystal Chemistry, McGraw Hill, New York, (1983).

[3] D. J. Dave, K. D. Parikh, B. B. Parekh and M. J. Joshi, Growth and spectroscopic, thermal, dielectric and SHG studies of L – Threonine doped KDP crystal, J. of Optoelectronic & Adv. Mater. 11 (2009) 602-609.

[4] K. D. Parikh, D. J. Dave and M. J. Joshi, Crystal growth, thermal, optical and dielectric properties of L – Lysine doped KDP crystals, Mod. Phys. Letts. B 23 (2009) 1589-1602.

DOI: 10.1142/s0217984909019740

[5] S. K. Arora, G. S. Trivikram Rao and M. M. Batra, Vickers micromechanical indentation of BaMoO4 crystals, J. Mater. Sci. 19 (1984) 297-302.

DOI: 10.1007/bf02403138

[6] B. S. Shah, Crystal perfection of adamantane by micro-identation, Cryst. Res. & Technol. 17 (1982) K27-K29.

DOI: 10.1002/crat.2170170327

[7] N. P. Rajesh, V. Kannan, P. Santhana Ranghavan, P. Ramasamy and C. W. Lan, Optical and microhardness studies of KDP crystals grown from aqueous solutions with organic additives, Mater. Lett. 52 (2002) 326-328.

DOI: 10.1016/s0167-577x(01)00415-3

[8] M. S. Joshi and A. V. Antony, Nucleatin and growth of potassium dihydrogen phosphate crystals in silica gel, Bull. Mater. Sci. 2 (1980) 31-33.

DOI: 10.1007/bf02748532

[9] M. S. Joshi, A. V. Antony and P. Mohan Rao, Microhardness investigations on potassium dihydrogen phosphate crystals, Kristall and Technik 15 (1980) 743-746.

DOI: 10.1002/crat.19800150621

[10] S. Anbukumar, R. Dhansekaran and P. Ramasamay, On the Growth Kinetics and Mechanism of ADP-KDP Mixed Crystals, Ind. J. Phys 61A (1987) 419-422.

[11] S. Sengupta and S. P. Sengupta, Microhardness studies in gel-grown ADP and KDP crystals, Bull Mater. Sci. 15 (1992) 333-338.

DOI: 10.1007/bf02747642

[12] X. S. Shajan and C. Mahadeven, On the growth of calcium tartrate tetrahydrate single crystals, Bull. Mater. Sci. 27 (2004) 327-331.

DOI: 10.1007/bf02704767

[13] W. A. Wooster, Widersande and Science Anwendung, Rep Prog. Phys. 1 (1953) 62.

[14] F. Kick, Das Gesetzder Proportionalen Winderstande and Science anwendung, Leipzig, Felix, 1885.

[15] K. K. Bamzai, P. N. Kotru and B. M. Wanklyn, Fracture mechanics, crack propagation and microhardness studies on flux grown ErAlO3 single crystals, J. Mater. Sci. Technol. 16 (2000) 405-410.

DOI: 10.1016/s0254-0584(99)00192-3

[16] B. W. Mott, Microhardness Indentation Testing, Butterworths, London, (1956).

[17] C. Hays and E. G. Kendall, An analysis of knoop hardness, Metallography 6 (1973) 275-282.

[18] H. Li and R. C. Bradt, The microhardness indentation load size effect in rutile and cassiterite single crystals, J. Mater. Sci. 28 (1993) 917-926.

DOI: 10.1007/bf00400874