Structure and multiferroic properties of BiFeO3 powders |
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| Authors: | De-Chang Jia Jia-Huan Xu Hua Ke Wen Wang Yu Zhou |
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| Affiliation: | 1. Department of Physics, Andhra University, Visakhapatnam, 530003, India;2. Thin Film Magnetism Group, Cavendish Laboratory, Department of Physics, University of Cambridge, Cambridge, CB3 0HE, UK;1. Department of Physics, Aligarh Muslim University, Aligarh 202002, India;2. Department of Applied Physics, Z.H. College of Engineering and Technology, Aligarh Muslim University, Aligarh 202002, India;3. Materials Science Programme, Indian Institute of Technology, Kanpur 208016, India;1. Centro de Investigación en Materiales Avanzados S.C., Miguel de Cervantes 120, Complejo Industrial Chihuahua, Chihuahua, Chih. 31109, Mexico;2. Universidad Autónoma de Ciudad Juárez, Ave. del Charro 450 Norte, Cd. Juárez, Chih. 32310, Mexico;3. Department of Mechanical and Aerospace Engineering, University of California, San Diego, 9500 Gilman Dr. – MC 0411, La Jolla, CA 92093-0411, USA |
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| Abstract: | Bismuth ferrite powders were synthesized by a simple sol–gel method at the temperature as low as 450 °C. Single phase BiFeO3 powders with a rhombohedral perovskite structure were fabricated after Bi–Fe gels were calcined at 450–650 °C. Atomic ratio of Bi to Fe is approximately 1:1 for BiFeO3 powders, as determined by energy dispersive X-ray spectrometer. BiFeO3 powders show weak ferromagnetism at room temperature and strong size-dependent magnetic properties, which is different from the linear M–H relationship in BiFeO3 ceramics. Dielectric anomaly at round 330 °C near the magnetic transition point corresponds to the antiferromagnetic to paramagnetic phase transition, indicating the coupling between polarization and magnetization in BiFeO3 powders. A reversible ferroelectric phase transformation of BiFeO3 powders has been detected at 827 °C by a differential thermal analysis. |
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