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Erschienen in:
01.07.2015
Synthesis and study of structural, magnetic and microwave absorption properties in multiferroic BiFeO3 electroceramic
Erschienen in: Journal of Materials Science: Materials in Electronics | Ausgabe 7/2015
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Abstract
Phase pure nano-sized BiFeO3 (BFO) has been successfully prepared by citrate based sol–gel method. X-ray diffraction study revealed the formation of pure and well-crystallized BiFeO3 nano-crystallites in a rhombohedral perovskite phase for the samples sintered at 600 °C. The examination of microstructure showed uniform hexagonal shaped grains. From magnetisation measurement, it was observed that an increase in sintering temperature from 600 to 700 °C decreased the remanent magnetization from 0.025 to 0.003 emu/g suggesting a weak ferromagnetic nature at room temperature. Moreover, better microwave absorption properties with minimum reflection loss were also observed. Impedance measurements were performed by vector network analyser in frequency range 8.2–12.4 GHz for the sample annealed at 700 °C. From the dielectric permittivity (ε = ε′ − jε″) and magnetic permeability (µ = µ′ − jµ″) measurements, it was found that the observed dielectric and magnetic losses were higher in the case of BFO sintered at 700 °C.