Effects of crystalline phase formation of multiferroic BiFeO3 on microwave absorption characteristics
- 122 Downloads
This paper reports a study of the microwave absorption properties of multiferroic BiFeO3 (BFO) epoxy resin composites. The effects of various sintering temperatures on the crystalline phase of BFO and its microwave absorption characteristics were critically analyzed. BFO nanoparticles were synthesized by mechanical activation high energy ball milling (HEBM) with post heat treatment over various temperatures ranging from 700 to 800 °C. The XRD results showed by using the HEBM method, BFO phase is formed at a lower sintering temperature of 700 °C compared to conventional solid state reaction due to the enhanced diffusion rates. The phase composition and the grain sizes had significant influence on the permeability, permittivity and reflection loss values of BFO composites measured by a network analyzer in the frequency range from 8 to 18 GHz. It was observed that the purity fraction of BFO phase and the grain sizes increased with the sintering temperature. By increasing the sintering temperature up to 775 °C, the microwave absorption properties were enhanced over a broad working frequency range corresponding to the reflection loss below − 10 dB (i.e. 90% absorption) due to crystalline phase changes. BFO samples sintered at 775 °C demonstrated higher absorption ability with RLmin − 40.5 dB over a 1.31 GHz bandwidth, showing that BiFeO3 has great potential as a microwave absorbing material.
This work was supported by Ministry of Higher Education Malaysia through the Long-Term Research Grant Scheme [LRGS/B-U/2013/UPNM/Defence & Security-P2]; and Universiti Putra Malaysia through Graduate Research Fellowship [GRF] and Putra Grant- Putra Graduate Initiative (IPS).
- 1.C.X. Hu, Stealth Coating Technology (Chemical Industry Press, Beijing, 2004), pp. 12–119Google Scholar
- 5.J. Zhang, L. Wang, Q. Zhang, Hydrothermal carbonization synthesis of BaZn2Fe16O27/Carbon composite microwave absorbing materials and its electromagnetic performance. J. Mater. Sci.: Mater. Electron. 26, 2538–2543 (2015)Google Scholar
- 7.M. Tahir, F. Majid, S. Riaz, S. Naseem, Size dependent ferromagnetism in bismuth iron oxide nanoparticles for magnetoelectric applications. Advances in Civil, Environmental and Materials Research (2016)Google Scholar
- 26.A. Santos, L.F. Cótica, S.N. De Medeiros, A. Paesano Jr., A.A. Coelho, S. Gama, M.Z. Venet, D. Garcia, J.A. Eiras, Structural, microstructural and magnetic properties of the high-energy ball milled BiFeO3 and BiFe0.95Mn0.05O3 ferroelectromagnetic compounds. Ferroelectrics 338, 1 233–239 (2006)CrossRefGoogle Scholar
- 34.S.B. Waje, M. Hashim, W.D.W. Yusoff, Z. Abbas, Room temperature measurements of physical and magnetic characteristics of polycrystalline material prepared using mechanically alloyed nanoparticles. Aust. J. Basic Appl. Sci. 3, 2716–2723 (2009)Google Scholar