Investigation of structural,optical, dielectric and magnetic studies of Mn substituted BiFeO3 multiferroics |
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| Affiliation: | 1. School of Physics & Materials Science, Shoolini University, Solan 173212, India;2. Himalayan Centre of Excellence in Nanotechnology, Shoolini University, Solan 173212, India;3. Nanotechnology Wing, Innovative Science Research Society, Shimla 171001, India;4. Department of Physics and Astrophysics, University of Delhi, Delhi 110007, India;1. Materials Science Laboratory, School of Physics, Devi Ahilya University, Khandwa Road Campus, Indore 452001, India;2. Laser Material Development and Devices Division, Raja Ramanna Centre For Advanced Technology, Indore 452013, India;1. Terminal Ballistics Research Laboratory, Ministry of Defence, Sector 30, Chandigarh 160030 India;2. Centre of Excellence in Nanotechnology and Materials Science, Shoolini University, Solan, HP 173212, India;3. Nanotechnology Wing, Innovative Science Research Society, Shimla 171001, India;4. Laboratoire des Sciences et Techniques, de l’Information, de la Communication et de la Connaissance,UMR CNRS 6285, 6 av. Le Gorgeu, CS 93837, 29238 Brest Cedex 3, France;1. Department of Physics, Institute of Technical Education & Research, Siksha ‘O’ Anusandhan University, Khandagiri, Bhubaneswar 751030, Odisha, India;2. Institute of Materials Research and Engineering, A*STAR (Agency for Science Technology and Research), 3 Research Link, Singapore 117602, Singapore;1. Department of Physics, South China University of Technology, Guangzhou 510640, China;2. Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100039, China;1. Magnetism and Nanomagnetic Materials Lab, Department of Physics, Pondicherry University, Pondicherry, India;2. Department of Physics, Arignar Anna Arts College, Villupuram, India;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 |
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| Abstract: | A series of Mn doped BiFeO3 with composition BiMnxFe1?xO3 (x = 0.0, 0.025, 0.05, 0.075, 0.1) was synthesized via a citrate precursor method. Structural, morphological, optical, electrical and magnetic properties were investigated by using various measurement techniques. XRD patterns confirmed that the materials possess distorted rhombohedral structure with space group R3c. Average crystallite size was found to be in the range 18–36 nm. A decrease in the value of lattice parameters has been observed due to contraction of unit cell volume with Mn doping. Higher tensile strain for the prepared nanoparticles was observed in Hall-Williamson Plot. Field Emission Scanning Microscopy (FESEM) showed the spherical, uniform, dense nanoparticles in the range 80–200 nm. Reduction in grain size was observed which may be due to suppression of grain growth with Mn doping. FTIR studies reported two strong peaks at 552 cm?1 and 449 cm-1 which confirmed the pervoskite structure. Dielectric properties were studied by measuring the dielectric constant and loss in the frequency range 1 kHz to 1 MHz. Magnetic hysteresis loop showed the retentivity (Mr) increasing from 0.0514 emu/g of BFO to 0.0931 emu/g of 10% Mn doping. Coercivity was found to increase upto 0.0582 T for 5% Mn doping and then reduced to 0.0344 T for 7.5% Mn doping. Saturation magnetization was observed to increase from 0.6791 emu/g for BFO to 0.8025 emu/g for 7.5% and then reduced to 0.6725 emu/g for 10% Mn doping in BFO. Improvement in dielectric and magnetic properties makes this material as a promising candidate for multifunctional device applications. |
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| Keywords: | Multiferroics X-ray diffraction Citrate precursor method Dielectric properties Magnetization |
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