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Synthesis and Thermoelectric Behavior in Nanoparticles of Doped Co Ferrites

Authors: M. Anis-ur- Rehman, A. Abdullah, Mariam Ansari , Zeb-un-Nisa, M. S. Awan


Samples of CoFe2-xCrxO4 where x varies from 0.0 to 0.5 were prepared by co-precipitation route. These samples were sintered at 750°C for 2 hours. These particles were characterized by X-ray diffraction (XRD) at room temperature. The FCC spinel structure was confirmed by XRD patterns of the samples. The crystallite sizes of these particles were calculated from the most intense peak by Scherrer formula. The crystallite sizes lie in the range of 37-60 nm. The lattice parameter was found decreasing upon substitution of Cr. DC electrical resistivity was measured as a function of temperature. The room temperature thermoelectric power was measured for the prepared samples. The magnitude of Seebeck coefficient depends on the composition and resistivity of the samples.

Keywords: Ferrites, crystallite size, drift mobility, seebeck coefficient, thermopower.

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[1] D. R. Mane, U. N. Devatwal and K. M. Jadhav, "Structural and magnetic properties of aluminium and chromium o-substituted cobalt ferrite", Mat. Lett. Vol. 44, p 91, 2000
[2] I. C. Nlebedim, N. Ranvah, P. I. Williams, Y. Melikhov, F. Anayi, J. E. Synder, A. J. Moses and D. C. Jiles, "Influence of vacuum sintering on microstructure and magnetic properties of magnetostrictive cobalt ferrite", J. Magn. Magn. Mat. Vol. 321, p 2528, 2009
[3] S. Mahalakshmi, K. S. Manja, "ac electrical conductivity and dielectric behavior of nanophase nickel ferrites", J. All. Comp. vol. 457, p 522, 2008
[4] S. A. Mazen, S. F. Mansour, E. Dhahri, H. M. Zaki, A. Elmosalami, "The infrared absorption and dielectric properties of Li-Ga ferrite", J. All. Comp. vol. 470, p294, 2009
[5] M. A. Elkestawy, "AC conductivity and dielectric properties of, Zn1−xCuxCr0.8Fe1.2O4 spinel ferrites", J. All. Comp. vol. 492, p616, 2010
[6] M. El-Shabasy, "DC electrical properties of Zn-Ni ferrites", J. Magn. Magn. Mater. Vol. 172, p 188, 2007
[7] R. S. Devan, Y. D. Kolekar, B. K. Chougule,"Effect of cobalt substitution on the properties of nickel-copper ferrite", J. Phys. Condens. Matter. Vol. 18, p 9809, 2006
[8] C. Liu, A. J. Rondinone and Z. J. Zhang, "Synthesis of magnetic spinel ferrite CoFe2O4 nanoparticles from ferric salt and characterization of the size-dependent superparamagnetic properties", Pure App. Chem. Vol. 72 , p 37, 2000
[9] L. Liangchao, H. Liua, W. Yuping, J. Jing, X Feng, "Preparation and magnetic properties of Zn-Cu-Cr-La ferrite and its nanocomposites with polyaniline", J. Coll. Int. Sci. vol. 321, p 265, 2008
[10] M. A. Gabal, Y. M. Al Angari, "Effect of chromium ion substitution on the electromagnetic properties of nickel ferrite", Mater. Chem. Phys. Vol. 118, p 153, 2009
[11] S. A. Mastia, A. K. Sharmab, P. N. Vasambekarc, A. S. Vaingankarc, Influence of Cd2+ and Cr3+ substitutions on the magnetization and permeability of magnesium ferrites", J. Magn. Magn. Mater. Vol. 305, p 436, 2006
[12] H. L. Seung, J. Y. Sang, J. L. Gi, S. K. Hong, H. Y. Chul, A. Kyungsoo, H. L. Dong, H. K. Keu, "Electrical and magnetic properties of NiCrxFe2├┐xO4 spinel (0 _ x _ 0.6)", Mater. Chem. Phy. Vol. 61, p 147, 1999
[13] Ch. Venkateshwarlu, D. Ravinder, "Thermoelectric power studies of Cu-Co ferrites", J. All. Comp. vol. 426, p 4, 2006
[14] D. Ravinder, A. C. S. Reddy, "Thermoelectric power studies of Co-Ge ferrites", J. All. Comp. vol. 353, p 86, 2003
[15] M. M. Masada, M. A. Ahmed, M. A. El-Haiti, S. M. Atria, "Semiconductive properties of Cu-Cr ferrites", J. Magn. Magn. Mater. Vol. 150, p 51, 1995
[16] O. Yamashita, "Effect of linear and non-linear components in the temperature dependences of thermoelectric properties on the energy conversion efficiency", Ener. Conv. Manag. Vol. 50, p 1968, 2009
[17] M. J. Iqbal and R. A. Khan, "Enhancement of electrical and dielectric properties of Cr doped BaZn2 W-type hexaferrite for potential applications in high frequency devices", J. All. Comp. vol. 478 , p 847, 2009
[18] M J Iqbal and M R Siddiquah, Electrical and magnetic properties of chromium-substituted cobalt ferrite Nanomaterials", J. All. Comp. vol. 453, p 513, 2008