Size dependent morphology, magnetic and dielectric properties of BiFeO 3 nanoparticles
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MRS Advances © 2019 Materials Research Society DOI: 10.1557/adv.2019.167
Size dependent morphology, magnetic and dielectric properties of BiFeO3 nanoparticles Nidhi Sheoran1, Monika Saini1, Ashok Kumar1, Vinod Kumar*1, Tanuj Kumar2, Mukesh Sheoran3 1
Department of Physics, Deenbandhu Chhotu Ram University of Science and Technology, Murthal 131039, Haryana, India.
2
Department of Nanosciences and Materials, Central University of Jammu, Jammu and Kashmir, India.
3
Department of Physics, Pt. NRS Govt. College, Rohtak, Haryana, India.
*E-mail: [email protected], [email protected]
Abstract
Nano-sized BiFeO3 were synthesized by sol-gel auto combustion method and report the effect of different annealing temperature (400 OC, 500 OC, 600 OC) on phase formation, morphology, magnetic and dielectric properties of synthesized bismuth ferrite (BiFeO3) nanoparticles. The phase formation of BFO nanoparticles were confirmed by X-ray diffraction pattern. Further, significant increment in particle size with increasing annealing temperature was estimated by field emission electron microscopy (FESEM). Magnetization curve showed the soft ferromagnetic behavior of the samples annealed at 400 OC and 500 OC that was explained on the basis of disturbance of spiral modulated long range antiferromagnetic order of bulk BFO. Dielectric response revealed decrease in dielectric constant with increasing annealing temperature. BFO is a room-temperature multiferroic material so it is potential candidate for various applications viz. Water waste treatment, gas sensors and photovoltaic cells in rural areas.
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1. INTRODUCTION: Novel devices such as sensors, actuators, magnetic recording media and spintronics can be fabricated if magnetic and electric order can be controlled together. Multiferroic materials show coupled ferroelectric and magnetic properties [1]. Among the few materials perovskite bismuth ferrite BiFeO3 (BFO) crystallizes in rhombohedral (R3c) structure and having ferroelectric Curie temperature (TC ~ 830 OC) and G-type antiferromagnetic Néel temperature (TN ~ 370 OC) which is higher than room temperature [2]. The ferroelectricity in BFO is connected to the Bi 3+ ions lone pair electrons in 6s2 orbital and origin of magnetism is due to the partially field d orbital of Fe ions. In rural areas, the environmental applications in wastewater treatment (particularly the degradation of Methylene Blue (MB) and Rhodamine B (RhB) dyes) using BFO gradually received the attention of scientific communities owing to its special attributes including the weak ferromagnetic order at room temperature and thus permitting it to be recycled easily from treated solution. BFO nanoparticles also exhibited excellent gas sensing properties, which were potentially useful for high-quality gas sensors in r
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