Dielectric and ferroelectric properties of Ho-doped BiFeO3 nanopowders across the structural phase transition |
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| Affiliation: | 1. Center for Solid State Physics and New Materials, Institute of Physics Belgrade, University of Belgrade, Pregrevica 118, 11080 Belgrade, Serbia;2. Institute for Nuclear sciences, Centre of Excellence-CextremeLab \"Vinča\", University of Belgrade, 11000 Belgrade, Serbia;3. Faculty of Physics, University of Belgrade, Studentski trg 12-16, 11000 Belgrade, Serbia;4. Institute for Multidisciplinary Research, University of Belgrade, Kneza Višeslava 1, 11000 Belgrade, Serbia;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 and Material Science and Engineering, Jaypee Institute of Information Technology, A-10, Sector-62, Noida 201309, India;2. Applied Science Department, Krishna Engineering College, Ghaziabad 201007, India;1. Department of Materials Science, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, India;2. Department of Electronics and Telecommunication Engineering, Jadavpur University, Kolkata-700032, India;1. Shenzhen Key Laboratory of Flexible Memory Materials and Devices, College of Physics and Optoelectronic Engineering, Shenzhen University, Nanhai Ave. 3688, Guangdong, 518060, PR China;2. Department of Physics, School of Natural Sciences, National University of Science & Technology, Islamabad, 44000, Pakistan;3. Department of Information and Communication Engineering, Beijing University of Technology, Beijing, PR China;4. Institute of Advanced Study, Shenzhen University, PR China;4. Key laboratory of Optoelectronic Devices and Systems of Ministry Education, Shenzhen University, PR China |
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| Abstract: | We have studied Ho-doped BiFeO3 nanopowders (Bi1−xHoxFeO3, x = 0–0.15), prepared via sol-gel method, in order to analyse the effect of substitution-driven structural transition on dielectric and ferroelectric properties of bismuth ferrite. X-ray diffraction and Raman study demonstrated that an increased Ho concentration (x ≥ 0.1) has induced gradual phase transition from rhombohedral to orthorhombic phase. The frequency dependent permittivity of Bi1−xHoxFeO3 nanopowders was analysed within a model which incorporates Debye-like dielectric response and dc and ac conductivity contributions based on universal dielectric response. It was shown that influence of leakage current and grain boundary/interface effects on dielectric and ferroelectric properties was substantially reduced in biphasic Bi1−xHoxFeO3 (x > 0.1) samples. The electrical performance of Bi0.85Ho0.15FeO3 sample, for which orthorhombic phase prevailed, was significantly improved and Bi0.85Ho0.15FeO3 has sustained strong applied electric fields (up to 100 kV/cm) without breakdown. Under strong external fields, the polarization exhibited strong frequency dependence. The low-frequency remnant polarization and coercive field of Bi0.85Ho0.15FeO3 were significantly enhanced. It was proposed that defect dipolar polarization substantially contributed to the intrinsic polarization of Bi0.85Ho0.15FeO3 under strong electric fields at low frequencies. |
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| Keywords: | Sol-gel processes X-ray methods Dielectric properties Ferroelectric properties Perovskites |
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