Journal
CERAMICS INTERNATIONAL
Volume 47, Issue 3, Pages 3780-3788Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2020.09.235
Keywords
Bismuth ferrite; Perovskite; Relaxor ferroelectric; Energy storage ceramic; Charge-discharge
Categories
Funding
- State Key Laboratory of Electrical Insulation and Power Equipment [EIPE19209]
- Fundamental Research Funds for the Central Universities [XDJK2018B009]
- National Natural Science Foundation of China [51672226]
- Chongqing Research Program of Basic Research and Frontier Technology [cstc2018jcyjAX0356]
- Chongqing College Student innovation and Entrepreneurship Program of Southwest University [S202010635143]
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The introduction of Ba(Zn1/3Nb2/3)O-3 (BZN) disrupts long-range order domains and improves the energy storage performance of lead-free ceramics. With increased BZN content, the dielectric relaxation behavior is enhanced, hysteresis loop becomes thinner, remnant polarization decreases, and the breakdown electric field increases to 180 kV/cm in 15BZN.
Pb-free bulk ceramics (1-x)[0.65BiFeO(3)-0.35BaTiO(3)]-xBa(Zn1/3Nb2/3)O-3 were produced by traditional solid-state reaction route. In this experiment, Ba(Zn1/3Nb2/3)O-3 (BZN) was introduced to destroy long-range order domains in order to obtain higher energy storage performance. Impedance and XPS analysis indicate that oxygen vacancies exist and participate in relaxation processes at high temperatures. With the increase of BZN content, the dielectric relaxation behavior is improved, the hysteresis loop becomes thinner, remnant polarization decreases, and the breakdown electric field increases to 180 kV/cm in 15BZN. A maximum Wrec (1.62 J/cm(3)) is eventually reached in 7BZN with great temperature stability. The highest efficiency is 91% in 15BZN with Wrec of 1.28 J/cm(3). Charge-discharge tests show that ceramics have a quick discharge time of t(0.9) < 0.1 mu s, which makes BZN-doped ceramics a potential candidate for energy storage devices.
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