首页|Lead-free (Sr0.7Ca0.3)1?1.5xBixTiO3 ceramics with temperature stable energy storage density and discharge efficiency for pulsed power technology
Lead-free (Sr0.7Ca0.3)1?1.5xBixTiO3 ceramics with temperature stable energy storage density and discharge efficiency for pulsed power technology
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NSTL
Elsevier
? 2022 Elsevier B.V.Lead-free energy storage ceramics have attracted a large concentration for their significant role in pulsed power technology. Here, environmentally friendly (Sr0.7Ca0.3)1?1.5xBixTiO3 relaxor ferroelectric ceramics are systematically studied. The introduction of Bi2O3 can enhance polarization. As the Bi2O3 content increases, the dielectric constant rises from 300 to 774, while the dielectric loss is less than 0.5% under a measurement frequency of 1 kHz. For the Sr0.49Ca0.21Bi0.2TiO3 ceramic, an energy storage density (W) of 2.035 J cm?3 and a high energy storage efficiency (η) of 91.84% achieved under an electric field of 260 kV cm?1. The variation rate of the dielectric constant is less than 15% (compared with the capacitance at 25 °C) in the temperature range of ? 55–125 °C, meeting the requirement of the EIA X7R specification, and the W and discharge energy density (Wd) also exhibit desirable temperature stability in the temperature range of 30 °C to 150 °C. These results are related to the homogeneous phase transition and low concentration of oxygen vacancies. The thermal activation of polar nanoregions (PNRs) partially compensates for the reduction of polarization caused by lattice expansion, which also contributes to the temperature stability. Taken together, the results of this study indicate the Sr0.49Ca0.21Bi0.2TiO3 ceramics have potential as a target for developing high energy storage lead-free ceramic capacitors.
State Key Laboratory of Environment-friendly Energy Materials School of Materials Science and Engineering Southwest University of Science and Technology
State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of China
NSTL
Elsevier
