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Extension of modified classical theory to nucleation of NKAP from aqueous solutions

S. K. GEETHA1,* , G. CHANDRASEKAR2

Affiliation

  1. Department of Physics, Government Arts College, Nandanam, Chennai – 600 035, India
  2. Department of Chemistry, M.P.B. Government Girls Higher Secondary School, Tambaram East, Chennai – 600 059, India

Abstract

Induction period was recorded for pure and 1mol% of Na+ added KAP solutions at different supersaturation values at 45˚C using visual observation method. A plot of 1/ (lnS)2 against ln τ is determined. 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. The critical supersaturation ratio for the pure and 1mol% Na+ doped KAP solutions at 45˚C was evaluated to be 1.00473 and 1.003485 respectively. Correction was made to the interfacial energy based on the thermodynamical approach. An attempt has been made to calculate the nucleation parameters corresponding to the critical supersaturation ratio using the modified classical nucleation theory..

Keywords

Nonlinear optical materials, Induction period, Interfacial energy, Nucleation parameters, Growth from solutions, X-ray diffraction.

Submitted at: Sept. 17, 2013
Accepted at: May 15, 2014

Citation

S. K. GEETHA, G. CHANDRASEKAR, Extension of modified classical theory to nucleation of NKAP from aqueous solutions, Journal of Optoelectronics and Advanced Materials Vol. 16, Iss. 5-6, pp. 745-749 (2014)