Modulation of Ferromagnetism and Dielectric Properties through Critallite Size Control and SPS in BiFeO3
Abstract
The magnetic and dielectric behavior of bismuth ferrites synthesized by milling processes and tuned by crystallite size reduction and microdeformation generated by mechanical milling is reported. Stoichiometric mixtures of Bi2O3 and Fe2O3 were used, ground for 5 hours. The reduction of crystallite size was carried out at different grinding times (0-60 min) with a percentage of 5% by weight of methanol. Crystallite size and microdeformation were evaluated by X-ray diffraction. Magnetic behavior was evaluated with vibrating sample magnetometry. The powders obtained were sintered by spark plasma at 750 °C. The results show a transformation of the BiFeO3 phase to Bi2Fe4O9 with longer crystallite size reduction times. The relationships between microstructural transformation and oxidation-reduction reactions, as well as antiferromagnetic-ferromagnetic changes, are discussed. The dielectric properties decreased with longer crystallite size reduction times.
Downloads
References
Bertinshaw J., Maran R., Callori S.J., Ramesh V., Cheung J., Danilkin S.A., Lee W.T., Hu S., Seidel J., Valanoor N., Ulrich C., 2016. Direct evidence for the spin cycloid in strained nanoscale bismuth ferrite thin films, Nat. Commun. 7, 1-7. DOI: 10.1038/ncomms12664.
Kubel H., Schmid F., 1990. Structure of a ferroelectric and ferroelastic monodomain crystal of the perovskite BiFeO3, Acta Crystallogr. B Struct. Sci. B46, 698-702.
Mi L., Jensen T.N., Christensen M.,2011. High-temperature and high-pressure aqueous solution formation, growth, crystal structure, and magnetic properties of BiFeO3 nanocrystals, Chem. Mater. 23,1158-1165. DOI:10.1021/cm102575w.
Saenrang W., Davidson B.A., Maccherozzi F., Podkaminer J.P., Irwin J., Johnson R.D., Freeland J.W., Iniguez J., Schad J.L., Reierson K., Frederick J.C., Vaz C.A.F., Howald L., Kim T.H., Ryu S., 2017. Deterministic and robust roomtemperature exchange coupling in monodomain multiferroic BiFeO3 heterostructures, Nat. Commun. 8,1-8 DOI: 10.1038/s41467-017- 01581-6.
Vijayasundaram S.V., Suresh G., Kanagadurai R., 2015. Synthesis, thermal, structural, and magnetic properties of phase-pure nanocrystalline BiFeO3 via wet chemical route, Appl. Phys. A 121, 681-688 DOI:10.1007/ s00339-015-9454-z.
Zhou J.P., Xiao R.J., 2015. Novel behaviors of single crystalline BiFeO3 nanorods hydrothermally synthesized under magnetic field, J. Mater. Chem. C. 3, 6924e6931. DOI:10.1039/ c5tc00747j.
Copyright (c) 2024 Fernando Pedro-García, Omar Rosales González, Félix Sánchez De Jesús, Claudia Alicia Cortés Escobedo
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
