Paper Title
Microwave-Synthesized Zinc-Substituted Cobalt Ferrite Nanoparticles Structural Characterization

Abstract
Single-phase spinal ferrites containing cobalt, zinc, and substituted magnetic nanoparticles of typical size 389A are synthesized using a microwave combustion approach modified by a post treatment procedure.The post-treatment increases crystalline rather than changing the crystal structure. Powder x-ray diffraction and Fourier Transform Infrared (FTIR) research back this up. Citric acid is employed as a source of energy. In x-ray and FTIR, the freshly produced sample reveals an impurity phase.The unreacted citrate molecule adsorbed on the particle surface causes this. It has been demonstrated that by treating the sample with 0.1 M HCl, the impurity phase can be removed and a pure single phase obtained. After the impurity is removed, the magnetization at 7.5 kOe increases by about 7%. Samples are treated with NaCl and heated at 200°C for four hours to remove surface adsorbed OH ions. The XRD results show that the treatment has no effect on crystallite size or distribution, but it does remove the OH ion. The FTIR analysis also confirms this. As a result, this improved approach can be utilized to make pure nanocrystalline spinal ferrites samples. Keywords - Microwave technique, ferrite, nanoparticles.