Title: Photoluminescence, magnetic and electrical properties of Co-ferrite nanoparticles synthesised via sol-gel auto-combustion method

Authors: Neama Gomaa Imam; Salwa Mohamed Ismail; Mohammed Yehia Elbahrawy; Adel Mohammed Hashhash

Addresses: Experimental Physics Department, Nuclear Research Center, Atomic Energy Authority, 13759, Cairo, Egypt ' Reactor Physics Department, Nuclear Research Center, Atomic Energy Authority, 13759, Cairo, Egypt ' Reactor Physics Department, Nuclear Research Center, Atomic Energy Authority, 13759, Cairo, Egypt ' Reactor Physics Department, Nuclear Research Center, Atomic Energy Authority, 13759, Cairo, Egypt

Abstract: Herein, we report magnetic, photoluminescence and electric properties for CoFe₂O₄ (CFO) nanoparticles. The CoFe₂O₄ was prepared by a citrate auto-combustion method. X-ray diffraction confirmed the crystallisation of pure CoFe₂O₄ phase with an average size of about 27 nm. The FT-IR spectrum confirmed the intrinsic cation vibrations for the spinel structure. Magnetisation values for CoFe₂O₄ nanoparticles are lower when compared to the literature values for bulk samples. The variation of dielectric constant, dielectric loss tangent and AC conductivity for CoFe₂O₄ nanoparticles at different temperature and as a function of frequency has been studied. The results revealed that the magnetic properties depend on the particle size and cation distribution, whereas the role of particle size is more significant. The data from vibrating sample magnetometer (VSM) and photoluminescence (PL) have been analysed for exploring their applications.

Keywords: spinel ferrites; synthesis; characterisation; cobalt ferrite; nanoparticles; sol-gel auto-combustion; photoluminescence; magnetic properties; electrical properties; dielectric constant; dielectric loss tangent; AC conductivity; particle size; cation distribution.

DOI: 10.1504/IJNP.2014.067601

International Journal of Nanoparticles, 2014 Vol.7 No.3/4, pp.170 - 189

Received: 06 May 2014
Accepted: 03 Jul 2014
Published online: 28 Feb 2015 *

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