Enhanced energy storage properties in La(Mg1/2Ti1/2)O3-modified BiFeO3-BaTiO3 lead-free relaxor ferroelectric ceramics within a wide temperature range |
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| Affiliation: | 1. Department of Materials Science and Engineering, University of Sheffield, Sheffield S1 3JD, UK;2. Christian Doppler Laboratory for Advanced Ferroic Oxides, Sheffield Hallam University, Sheffield S1 1WB, UK;3. Department of Materials Science and Engineering, North China University of Technology, Beijing 100144, China;1. School of Materials Science and Engineering, Changwon National University, Gyeongnam 51140, Republic of Korea;2. Department of Metallurgy and Materials Engineering, UET Taxila, Taxila, Pakistan;1. School of Materials Science and Chemical Engineering, Ningbo University, Ningbo, Zhejiang 315211, China;2. China-Australia Institute for Advanced Materials and Manufacturing, Jiaxing University, Jiaxing, Zhejiang 34001, China;1. School of Materials Science and Engineering, Changwon National University, Gyeongnam, 51140, Republic of Korea;2. School of Chemical and Process Engineering, University of Leeds, Leeds, LS2 9JT, United Kingdom;3. Department of Physics, Islamia College, Peshawar, KP, Pakistan;4. Department of Robotics Engineering, DGIST, Daegu, 42988, Republic of Korea;5. Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea |
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| Abstract: | A new ternary lead-free (0.67-x)BiFeO3-0.33BaTiO3-xLa(Mg1/2Ti1/2)O3 ferroelectric ceramic exhibited an obvious evolution of dielectric relaxation behavior. A significantly enhanced energy-storage property was observed at room temperature, showing a good energy-storage density of 1.66 J/cm3 at 13 kV/mm and a relatively high energy-storage efficiency of 82% at x = 0.06. This was basically ascribed to the formation of a slim polarization-electric field hysteresis loop, in which a high saturated polarization Pmax and a rather small remnant polarization Pr were simultaneously obtained. Particularly, its energy storage properties were found to depend weakly on frequency (0.2 Hz–100 Hz), and also to exhibit a good stability against temperature (25 °C–180 °C). The achievement of these characteristics was attributed to both a rapid response of the electric field induced reversible ergodic relaxor to long-range ferroelectric phase transition and a typical diffuse phase transformation process in the dielectric maxima. |
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| Keywords: | Bismuth ferrite Lead-free ceramics Relaxor ferroelectrics Energy-storage capacitors |
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