Electric and magnetic properties of Bi substituted cobalt ferrite nanoparticles: Evolution of grain effect

•Bismuth substitution evolves grain effect in nano-cobalt ferrite.•Significant rise in electrical resistivity was observed in modified system.•Interfacial polarization was suppressed successfully.•Enhancement in magnetic properties with the addition of bismuth. We have prepared Bismuth substituted n...

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Bibliographic Details
Published in:Journal of alloys and compounds 2015-06, Vol.634, p.239-245
Main Authors: Panda, R.K., Muduli, R., Behera, D.
Format: Article
Language:English
Subjects:
Bismuth
Ceramics
Combustion
Dielectric loss
Electrochemical impedance spectroscopy
Evolution
Ferrite
Grain boundaries
Grains
Magnetic measurements
Nanostructure
Reduction
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Summary:•Bismuth substitution evolves grain effect in nano-cobalt ferrite.•Significant rise in electrical resistivity was observed in modified system.•Interfacial polarization was suppressed successfully.•Enhancement in magnetic properties with the addition of bismuth. We have prepared Bismuth substituted nano-cobalt ferrite (CoFe2−xBixO4, x=0, 0.05, 0.1, 0.15) by auto combustion technique. The single phase XRD pattern confirmed the successful substitution of the larger cation. Surface morphology from FESEM image indicated the control particle growth (50–160nm) as a result of bismuth substitution. The increased particle size has effectively modified the electrical properties of the system in three major ways: (a) increase in resistivity, (b) evolution of grain relaxation and (c) reduction in dielectric loss and surface conduction. Additionally, magnetic behavior is also affected due to control particle growth. Magnetic hysteresis study at room temperature confirmed the rise in saturation magnetization (MS=74.5–86.5emu/g) and reduction in coercivity (HC=1633–1524Oe).
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2015.02.087