Structural, magnetic and electrical properties of Co-Ni-Mn ferrites synthesized by co-precipitation method

In present work, fine particles of Co1-xNixFe1.9Mn0.1O4 (x=0.2, 0.4, 0.6 and 0.8) system were prepared by co-precipitation method. X-ray diffraction (XRD) study of prepared sample confirms the cubic spinel phase formation. The microstructural features were examined by SEM images. Infrared absorption (IR) spectra shows two vibrational bands, one around 600 cm(-1) (nu(1)) and second around 400 cm(-1) (nu(2)) were attributed to the tetrahedral and octahedral group complexes of the spinel lattice respectively. The magnetic parameters viz, magnetization at 6 kOe (M-6kOe) and coercivity (H-c) were measured at room temperature under the field of 6 kOe. It is observed that, both M-6kOe and H-c decrease with increase of Ni content. The DC resistivity measurement with temperature indicates a semiconducting behavior of the samples. Frequency dependent dielectric constant (epsilon') shows the usual dispersion behavior, while linear variation of AC conductivity (sigma(AC)) with frequency confirms the conduction due to small polaron. (c) 2009 Elsevier B.V. All rights reserved.