Nanocrystalline forms of nickel ferrite (NiFe 2 O 4 ) have been synthesized with the aid of single step chemical combustion method using citric acid as fuel in the 1:1 ratio. The single phase formation of nickel ferrite was confirmed through powder X-ray diffraction (XRD). The presence of various functional groups was confirmed through Fourier transform infrared spectroscopic (FTIR) analysis and the compositional analysis was performed through Energy dispersive X-ray studies (EDX). The micro structural features of nanocrystallites were examined by scanning electron microscope (SEM). Surface morphology of the nanocrystalline form of NiFe 2 O 4 was also investigated through transmission electron microscopic (TEM) analysis. Magnetic measurements have showed the ferrimagnetic properties with Curie temperature @ 500°C. The obtained results are in good agreement with the reported values. The other results have been discussed in detail. ª 2015 The Authors. Production and hosting by Elsevier B.V. on behalf of King Saud University. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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Single crystals of L-threonine have been grown from aqueous solutions of different pH values. The crystal grown from the solution of isoelectric pH (PI) was found to have the best linear and nonlinear optical properties. The optical quality of L-threonine was improved greatly in the case of the crystal grown at PI. The morphology of the title crystal has been discussed in detail. The crystalline powder SHG efficiency of L-threonine crystals grown at PI was found to be 1.2 times that of KDP. Capacitance and dielectric loss measurements were also carried out, and the dielectric constant was calculated at room temperature in the frequency range 100 Hz-5 MHz. The dielectric constant of the crystalline sample remains constant for the entire frequency range studied.