Relaxor behavior of BaTiO3-BiYO3 perovskite materials for high energy density capacitors |
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| Affiliation: | 1. Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, Xi’an Jiaotong University, Xi’an 710049, Shaanxi, China;2. Xi’an Jiaotong University Suzhou Academy, Suzhou 215123, Jiangsu, China;3. Micro-optoelectronic Systems Laboratories, Xi’an Technological University, Xi’an 710032, Shaanxi, China;4. School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, China;1. Key Laboratory of Inorganic Functional Materials and Devices, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050, People''s Republic of China;2. University of the Chinese Academy of Sciences, Beijing 100049, People''s Republic of China;3. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, and School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, People''s Republic of China |
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| Abstract: | Dielectric materials with high dielectric constant and breakdown voltage are very promising for pulsed energy storage applications. In this paper, (1-x) BaTiO3-xBiYO3 (x=0–0.5) ceramics were synthesized using conventional solid-state reaction method. The ceramic structure transformed from ferroelectric tetragonal phases (x≤0.5) to pseudo-cubic phases (x≥0.1). When x=0.2, beyond the solid solubility limit of BaTiO3-BiYO3, the second phase and glassy phases were formed, accompanying lattice parameter excursion. It revealed a gradual change from classic ferroelectric behavior in pure BaTiO3 to highly diffusive and dispersive relaxor-like characteristics with BiYO3 content increasing. It exhibited high polarization maximum and low remnant polarization, which was favorable for energy storage in (1-x)BaTiO3-xBiYO3 ceramics, due to the disrupted long polarization, the created weak coupling and the formed second phase. Furthermore, the nonlinearity of the (1-x)BaTiO3-xBiYO3 ceramics were weakened obviously. A maximum energy storage density of 0.316 J/cm3 at 66 kV/cm with relative high energy efficiency of 82.7% was achieved in 0.8BaTiO3-0.2BiYO3 ceramic, which indicated that (1-x)BaTiO3-xBiYO3 ceramics were promising lead-free relaxor materials for energy storage applications. |
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| Keywords: | Dielectric property Breakdown strength Energy density Ceramics |
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