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- W4384008851 abstract "Dielectric ceramics with relaxor characteristics are promising candidates to meet the demand for capacitors in next-generation pulse devices. In this work, Ba0.85Ca0.15Zr0.1Ti0.9O3 (BCZT)-based lead-free ceramics with an ultrahigh recoverable energy storage density (Wrec) were designed and fabricated by introducing the relaxor end-member of Bi(Zn2/3Ta1/3)O3 (BZT). The addition of BZT disrupted the ferroelectric (FE) long-range order and triggered an FE-to-relaxor FE (RFE) phase, leading to the formation of locally polar nano-regions (PNRs) and significantly inhibiting grain growth. Meanwhile, the presence of PNRs with good thermal stability improved the temperature stability of both the dielectric constant (ε') and Wrec. More importantly, the breakdown electric field strength was significantly improved up to ~640 kV/cm, resulting in an ultrahigh Wrec of ~7.11 J/cm3 for the 8%BZT doped BCZT (BCZT-BZT8) ceramic. Furthermore, the BCZT-BZT8 ceramic exhibited excellent charge/discharge performances (CD ~ 458.4 A/cm2, PD ~ 50.4 MW/cm3, WD ~ 1.354 J/cm3, t0.9 ~ 320 ns) with good thermal stability in the temperature range of 298-373 K. The defect chemistry of the BCZT-BZT8 was explored using electron paramagnetic resonance (EPR) spectroscopy which revealed an EPR signal (g ~ 1.955), associated with oxygen vacancies. The above findings indicate that the novel composition of BCZT-BZT8 has great prospects in energy storage capacitor applications." @default.
- W4384008851 created "2023-07-13" @default.
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- W4384008851 date "2023-12-01" @default.
- W4384008851 modified "2023-10-12" @default.
- W4384008851 title "Ultrahigh energy storage density in Ba0.85Ca0.15Zr0.1Ti0.9O3-based lead-free ceramics by introducing a relaxor end-member" @default.
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- W4384008851 doi "https://doi.org/10.1016/j.jeurceramsoc.2023.07.020" @default.
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