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

Available online: 22 Feb 2015 *

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