Effect of pH on Structural Morphology and Magnetic Properties of Ordered Phase of Cobalt Doped Lithium Ferrite Nanoparticles Synthesized by Sol-gel Auto-combustion Method

Authors L.S. Kaykan1 , J.S. Mazurenko2, N.V. Ostapovych2, A.K. Sijo3, N.Ya. Ivanichok4

1Vasyl Stefanyk Precarpathian National University, 57, Shevchenko St., 76018 Ivano-Frankivsk, Ukraine

2Ivano-Frankivsk National Medical University, 2, Halytska St., 76000 Ivano-Frankivsk, Ukraine

3Department of Physics, Mary Matha Arts and Science College, Manathavady, 670645 Kerala, India

4G.V. Kurdyumov Institute for Metal Physics of NAS of Ukraine, Kyiv, Ukraine

Е-mail larysa.kaykan@gmail.com
Issue Volume 12, Year 2020, Number 4
Dates Received 16 April 2020; revised manuscript received 15 August 2020; published online 25 August 2020
Citation L.S. Kaykan, J.S. Mazurenko, et al., J. Nano- Electron. Phys. 12 No 4, 04008 (2020)
DOI https://doi.org/10.21272/jnep.12(4).04008
PACS Number(s) 71.20.Nr, 72.15.Eb, 72.20.Pa, 77.22.Gm, 73.22. – f, 76.80. + y
Keywords Sol-gel method (4) , Cobalt substitution, Nanocrystalline ferrites, pH effect, X-ray diffraction (19) , Magnetic properties (7) .

Cobalt doped lithium ferrite nanoparticles were synthesized at different pH by sol-gel method. The effect of pH on the physical properties of cobalt doped lithium ferrite nanoparticles has been investigated. The nanoparticles synthesized at different pH were characterized through X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDAX), Mossbauer spectroscopy and impedance spectroscopy. The XRD patterns were analyzed to determine the crystal phase of cobalt doped lithium ferrite nanoparticles synthesized at different pH. The results of XRD showed the formation of an unmixed cobalt-substituted lithium ferrite having an ordered phase of the spinel structure. SEM micrographs show that the structural morphology of the nanoparticles is highly sensitive to the pH during the synthesis process. The electrical properties of the nanoparticles were also investigated: conductivity, real and imaginary parts of the dielectric constant, loss tangent. These characteristics have been found to differ for nanoparticles synthesized at different pH values which may be caused by differences in the size and morphology of the nanoparticle surface.

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