EXTENSION OF MODIFIED CLASSICAL THEORY TO NUCLEATION OF LKAP FROM AQUEOUS SOLUTION

Year 2014, Volume: 6 Issue: 1, 53 - 59, 01.03.2014

S. K. Geetha G. Chandrasekar

https://doi.org/10.24107/ijeas.251217

Abstract

The dependence of the induction period of crystallization on super cooling was determined for the system lithium chloride—potassium acid phthalate (KAP) over the composition of 1mole % LiCl2. This dependence can be described by 1/ ( lnS) 2 against ln τ curve. In order to reduce the effect of heterogeneous nucleation on the nucleation parameters, the interfacial energy was calculated from the slopes determined in the linear region of the line plots. Nucleation parameters like free energy change, rate of nucleation and critical radius were determined using the value of interfacial energy. Correction was made to the interfacial energy based on the thermodynamically approach. An attempt has been made to calculate the nucleation parameters corresponding to the critical super saturation ratio using the modified classical nucleation theory

Keywords

Nonlinear optical materials, induction period, interfacial energy, nucleation parameters

References

• [1] Pacák, P., Horsák, L, and Sláma, L, Krist. Tech. 14, 741 (1979).
• [2] Pacák, P. and Sláma, L, Collect. Czechoslov. Chem. Commun. 46, 1629 (1981).
• [3] Pacák, P. and Sláma, L, J. Solution Chem. 8, 529 (1979).
• [4] Mohan Kumar R., Gopalakrishnan N., Jayavel R, and Ramasamy P., Investigations on the Nucleation Kinetics of L-Arginine Phosphate single crystals, Cryst. Res. Technol., 34, 1265- 1268 (1999).
• [5] Chenthamarai S., Jayaraman D., Ushasree P.M., Meera K., Subramanian C. and Ramasamy P., 1999, Experimental determination of induction period and interfacial energies of pure and nitro doped 4-hydroxyacetophenone single crystals, Mat. Chem. Phys., 8617, 1-5 (1999).
• [6] Paul D.P., Jayavel R., Subramanian C. and Ramasamy P., Investigations on nucleation thermodynamical parameters of NdBa2Cu3O7-δ (Nd123) crystallization by high temperature solution growth, Bull. Mater. Sci., 23, 79-82 (2000).
• [7] Rajesh N.P., Kannan V., Santhana Raghavan P., Ramasamy P. and Lan C.W., Nucleation studies and crystal growth of (NH4)H2PO4 doped with thiourea in supersaturated aqueous solutions, Mat. Chem. Phys., 76,181-186 (2002).
• [8] Zaitseva N.P., Rashkovich L.N. and Bogatyreva S.V. (1995), Stability of KH2PO4 and K(H,D)2PO4 solutions at fast crystal growth rates, J. Crystal Growth, 148, 276-282 (1995).