RARE METALS
·
2023
·Vol. 42
·期 11
·3839-3850
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IF 8.8
Zhou Xiao-Xiao,Tang Yu-Cheng,Li He-Zhang,Hao Yi-Jin,Xue Meng-Ping,Pei Jun,Peng Xiao-Yan,Zhang Bo-Ping
BiFeO 3 –BaTiO 3 (BF–BT) lead-free piezoelectric ceramics have high piezoelectricity and high Curie temperature ( T C ), but the mixed-valence Fe ions and Bi 3+ volatilization would promote the formation of Bi 25 FeO 40 /Bi 2 Fe 4 O 9 and oxygen vacancy, which greatly degrade the insulation properties required for polarization. In this study, it was found that the modification of BiAlO 3 (BA) in BF–BT ceramics could effectively solve these problems, reducing the leakage current to 1 × 10 −9 A·cm −2 and transiting the space charge-limited conduction to ohmic conduction. Because of the enhanced insulation properties and appropriate rhombohedral-pseudocubic phase ratio ( C R / C PC ), BF–BT– x BA ceramics in an optimized composition obtain enhanced piezoelectric performance: piezoelectric charge coefficient ( d 33 ) = 196 pC·N −1 , planar electromechanical coupling coefficient ( k p ) = 31.1%, T C = 487 °C and depolarization temperature ( T d ) = 250 °C; unipolar strain ( S uni ) = 0.17% and piezoelectric strain coefficient ( d 33 * ) = 335 pm·V −1 at 100 °C. Especially, d 33 exceeds 283 pC·N −1 at 233 °C and d 33 * is 335 pm·V −1 at 100 °C, showing an excellent high-temperature piezoelectricity and high depolarization temperature. The results are attributed to the domain structure of rhombohedral-pseudocubic phase coexistence and its high-temperature switching behavior. This work provides a feasible and effective approach to improve the high temperature piezoelectric properties of BF–BT– x BA ceramics, making them more suitable for high temperature applications. Graphical abstract
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
·
2019
·Vol. 217
·期 2
·1900721
·
IF 1.606
Xin Yi,Cong Ji,Gang Chen,Hongqi Yang,Hualei Yong,Chunlin Fu,Wei Cai,Rongli Gao,Tao Fan,Zhenhua Wang,Xiaoling Deng
(0.9 – x )BaTiO 3 –0.1BiYbO 3 – x BiAlO 3 ( x = 0, 0.02, 0.04, and 0.08) lead-free ferroelectric ceramics are synthesized using conventional sintering (CS) and microwave sintering (MWS) methods. The microstructure, dielectric and ferroelectric properties, relaxation behavior, and energy storage properties are investigated systematically. X-ray diffraction (XRD) patterns show a single perovskite phase for all samples. Scanning electron microscope (SEM) images indicate that MWS method can impede the grain growth, whereas the introduction of BiAlO 3 can lead to the increase in the grain size. Dielectric measurements reveal that an obvious dielectric relaxation behavior can be strengthened by MWS, and the improvement of the dielectric constant ( ε r ) of ceramics is realized by MWS. Incorporated with BiAlO 3 contributes to enhancement of the frequency and temperature stabilities of the dielectric constant for BaTiO 3 –BiYbO 3 ceramics. The slim hysteresis loops are observed, and the maximum polarization of the sample sintered by MWS is higher than that sintered by CS. The MWS samples possess a higher energy density which is about 2 times larger than that of CS samples, and the largest energy storage density ≈0.86 J cm −3 and energy storage efficiency ≈97.44% are, respectively, obtained at x = 0 and 0.04 for MWS ceramics.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2019
·Vol. 125
·期 6
·1-14
·
IF 1.784
Chen Gang,Fan Tao,Yang Hongqi,Fu Chunlin,Gao Rongli,Deng Xiaolin,Wang Zhenhua,Fan Peigeng,Cai Wei
(1 − x )BaTiO 3 – x BiAlO 3 relaxor ferroelectric ceramics were prepared by the conventional sintering (CS) and the microwave sintering (MWS) methods, respectively. The microstructure, the dielectric properties, the relaxation characteristic, the ferroelectric and the energy storage properties were investigated in detail. The results show that a single perovskite phase exists in ceramic samples sintered by CS and MWS. The addition of BiAlO 3 into BaTiO 3 and the MWS method result in the reduction of the grain size and the porosity of BaTiO 3 ceramic. This leads to the enhanced diffuse transition and frequency dispersion. The dielectric constant and loss decrease with increasing the BiAlO 3 content, and the temperature and the frequency stabilities are enhanced by introducing BiAlO 3 into BaTiO 3 . The remnant polarization ( P r ) increases initially and then decreases with the increase of BiAlO 3 content, the maximum values of P r (9.5 μC/cm 2 for CS and 7.27 μC/cm 2 for MWS) are obtained at x = 0.02. The addition of BiAlO 3 can elevate the variation of polarization Δ P ( P max − P r ), its maximum values (12.56 μC/cm 2 for CS ceramic and 12.2 μC/cm 2 for MWS ceramic) are acquired at x = 0.04, 0.08, respectively. The energy storage properties indicate that the energy storage density ( W rec ) increases, while the energy storage efficiency ( η ) firstly decreases and then increases with the increase of x .
研究领域:
材料科学
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电子工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2020
·Vol. 104
·期 2
·1169-1177
·
IF 3.502
Zhengwei Xiong,Gaomin Liu,Hengchang Nie,Yi Liu,Zhipeng Gao,Qian Liu,Xuefeng Chen,Jun Li,Leiming Fang,Qiang Yang,Xiaoqiang Zhang,Jinlong Tang,Genshui Wang,Xianlin Dong
Ferroelectric materials under shock compression can generate current and power by a drastic change of the remnant polarizations and surface bound charge. This behavior has been employed in applications involving nuclear fusion trigger, energy storage devices, and high pulse power sources. Despite the large power output in lead-containing ferroelectrics, lead-free materials are highly desirable owing to the environmental concerns. Herein, the phase transition behaviors and current outputs of 0.92Bi 0.5 Na 0.5 TiO 3 -0.08BiAlO 3 (BNT-8BA) materials are studied under high pressure. The BNT-8BA ferroelectric ceramics can be completely depolarized from polar to the nonpolar state under shock compression, resulting in a current output in the external circuit. The phase-transition-induced depolarization pressures of BNT-8BA are lower than those of the pure Bi 0.5 Na 0.5 TiO 3 under both dynamic and static high-pressure loads. These results can allow the understanding of the high-pressure behavior of BNT-8BA for application as ferroelectric pulsed power supply.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2024
·Vol. 21
·期 5
·3645-3651
·
IF 1.8
Jinghui Peng,Hengchang Nie,Yuou Yuan,Xiao Yong,Biao He,Genshui Wang,Fanglin Du,Liang Shi,Xiaofei Qu,Shuai Zhang
Mn-doped (1- x )Bi 0.5 (Na 0.8 K 0.2 ) 0.5 TiO 3 - x BiAlO 3 (Mn:BNKT- x BA) thin films were synthesized on lanthanum nickelate-coated silicon substrates by sol-gel method. The second phase issue of the film can be effectively addressed by optimizing the substrate, and the maximum polarization and breakdown strength can be increased by introducing the proper amount of Al 3+ , which is advantageous for the film for energy storage. The results have shown that the Mn:BNKT-0.03BA film exhibits superior ferroelectric properties (with remanent polarization (P r ) of 23.72 µC/cm 2 , maximum polarization (P max ) of 75.37 µC/cm 2 ), which could be an excellent candidate for ferroelectric thin film capacitors.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
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