Materials
·
2022
·Vol. 15
·期 9
·3180
·
IF 3.748
Xingru Zhang,Yinan Xiao,Chao Yang,Yuandong Wu,Min Wen,Junke Jiao,Rui Li,Liyuan Sheng,Wenchang Tan
Depolarization behavior is one of the main shortcomings of (Bi0.5Na0.5)TiO3-based ceramics. Considering the undesirable efficiency of traditional modification methods, in this paper a series of 0–3 type ceramic composites 0.85(Bi0.5Na0.5)TiO3-0.11(Bi0.5K0.5)TiO3-0.04BaTiO3-xmol% ZnO (BNKT-BT-xZnO)) were synthesized by introducing ZnO nanoparticles. The results of the X-ray diffraction pattern (XRD) and energy dispersive spectroscopy (EDS) demonstrate that the majority of ZnO nanoparticles grow together to form enrichment regions, and the other Zn2+ions diffuse into the matrix after sintering. With ZnO incorporated, the ferroelectric–ergodic relaxor transition temperature,TF-R,and depolarization temperature,Td,increase to above 120 °C and 110 °C, respectively. The research on temperature-dependentP–Eloops verifies an attenuated ergodic degree induced by ZnO incorporation. For this reason, piezoelectric properties can be well-maintained below 110 °C. The electron backscatter diffraction (EBSD) was employed to investigate the stress effect. Orientation maps reveal the random orientation of all grains, excluding the impact of texture on depolarization. The local misorientation image shows that more pronounced strain appears near the boundaries, implying stress is more concentrated there. This phenomenon supports the hypothesis that potential stress suppresses depolarization. These results demonstrate that the depolarization behavior is significantly improved by the introduction of ZnO. The composites BNKT-BT-xZnO are promising candidates of lead-free ceramics for practical application in the future.Keywords:BNT-based ceramic composite;depolarization behavior;electric properties;stress;ZnO incorporation
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Xin-Yu Kang,Zhi-Hao Zhao,Yu-Kai Lv,Yejing Dai
The large temperature dependence of electro-strain for Bi 0.5 Na 0.5 TiO 3 (BNT)-based ceramics limits their practical applications. In this work, Li-doped BNT-based lead-free multi-layer piezoelectric ceramic actuators are prepared by solid-state reaction synthesis method. The multi-layer actuator structure is fabricated by gradient doping, in which each layer corresponds to different compositions, with enhanced temperature stability compared to the single-layer one. For specific composition, it could achieve maximum electro-strain value at a certain temperature. Therefore, the electro-strain of each layer in this BNT-based multi-layer actuator could compensate each other at different temperatures with improved temperature stability. Consequently, the electro-strain of the five-layer structure varies less than ∼12% when the temperature changes from 50 °C to 130 °C, and a large electro-strain of 600 pm/V could be obtained at 70 °C. This work provides an effective approach by gradient doping to broaden the use temperature range for BNT-based actuators with improved temperature stability.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·Vol. 47
·期 5
·6842-6847
·
IF 3.83
Shunjin Xiong,Rongxia Huang,Congfei Peng,Yejing Dai,Jiajiu Li,Wen Bai,Hua-Tay Lin
A series of HfO 2 -modified (Bi 0 .475 Na 0 . 405 K 0 . 055 Li 0.015 ) 0.95 Ba 0 . 05 Ti (1- x ) Hf x O 3 ( x = 0–0.015) lead-free ceramics were prepared. Results of detailed characterizations showed that the addition of HfO 2 had little influence on the grain size, and all of the samples showed the pure perovskite structure. As the Hf 4+ content increases, the samples changed from the normal ferroelectric phase to the ergodic relaxor state at room temperature, and the ceramics with x = 0.01 showed a high electro-strain of 0.295% at 6 kV/mm. Therefore, this study provides a new insight into of how the HfO 2 addition influences the ferroelectric property of the BNT-based ceramics by B-site substitution.
研究领域:
材料科学
·
无机非金属材料
·
功能陶瓷
·
铁电材料
·
压电材料
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 7
·1-12
·
IF 2.8
Zhu Haipeng,Wu Jinyuan,Hussain Fayaz,Ni Tao,Li Jiajing,Wang Yan,Xi Hao,Mao Minmin,Hu Ji,Liu Bing,Song Kaixin
Bi 0.5 Na 0.5 TiO 3 (BNT)-based ceramics with excellent electrostrain properties are considered to be one of the most promising lead-free alternative systems. In this work, appropriately deviating from the morphotropic phase boundary (MPB) range, the ceramics of (1− x )(0.75Bi 0.5 Na 0.5 TiO 3 -0.25Bi 0.5 K 0.5 TiO 3 )- x CaZrO 3 (abbreviated as 0.75BNT-0.25BKT- x CZ, x = 0, 0.01, 0.03, 0.05) were synthesized by the solid-state reaction method. The phase structure combined with the dielectric, ferroelectric, and field-induced strain properties was systematically analyzed. The X-ray diffraction patterns showed that CZ was well incorporated into the 0.75BNT-0.25BKT structure to form a single-solid solution. As CZ content increases, the phase structure constructed by the coexistence of rhombohedral and tetragonal phases gradually transforms into the pseudocubic phase. Meanwhile, the dielectric temperature spectra demonstrated the coexistence of ferroelectric and relaxor phases during the phase transition with the formation of the weakly coupled relaxor, implying the presence of nanodomains which were further confirmed by the high-resolution transmission electron microscopy image. Interestingly, the maximum unipolar strain of 0.34% with a prominent increase of 70% and the hysteresis of 33% with a moderate increase of 26% were obtained simultaneously at x = 0.03 as compared to those at x = 0 (0.75BNT-0.25BKT). Further to this, this study investigated the origin of the large strain together with hysteresis variation and considered that reversible phase transition combined with relaxation behavior helps realize a tradeoff between large strain and low hysteresis, which provides an effective path for the further development of high-performance lead-free piezoelectric ceramics.
研究领域:
材料科学
·
陶瓷
·
压电材料
·
功能材料
·
固态化学
✓ 已验证
DOI
高影响因子
Journal of Energy Storage
·
2025
·
IF 9.8
Lingling Wu,Bin He,Yonggang Shuai,Wuwei Feng,Weiping Gong,He Qi,Yuqin Liu
In response to the urgent need for efficient and reliable energy storage solutions, this study investigates the synergistic integration of high-entropy and superparaelectric engineering in Bi 0.5 Na 0.5 TiO 3 -K 0.5 Na 0.5 NbO 3 (BNT-KNN) ceramics, thereby achieving superior comprehensive energy storage performance in moderate electric fields. With the incorporation of Sr(Sc 0.5 Ta 0.5 )O 3 (SST), the BNT-0.2KNN-0.2SST demonstrates a high recoverable energy density ( W rec > 7 J/cm 3 ) and efficiency ( η > 95 %) at 420 kV/cm and the BNT-0.3KNN-0.15SST achieves W rec ~ 8 J/ cm 3 and η > 91 % at 500 kV/cm. The optimized ceramics achieve excellent comprehensive energy storage performance, exceptional high-temperature stability (20–240 °C) and fatigue resistance (≥10 6 cycles) under moderate electric fields (300–500 kV/cm) synchronously. The synergistic combination of high-entropy design and superparaelectric state regulation can effectively suppress the drastic fluctuations of the permittivity and the thermally induced phase transitions, thereby maintaining excellent performance across a broader temperature range and significantly enhancing the cyclic life of BNT-based ceramics through the reduction of defect generation and aggregation. The synergistic combination of these properties suggests promising applicability in next-generation capacitor devices, especially for energy storage applications requiring reliable performance in extreme operational environments.
研究领域:
材料科学
·
储能技术
·
陶瓷工程
·
介电与电磁学
·
固态物理
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2024
·
IF 5.3
Gang Chen,Xue Bai,Cong Ji,Zhijun Zhou,Zixuan Zhang,Chao Chen,Zhengtang Su,Wei Cai,Rongli Gao,Chunlin Fu
Bi 0.5 Na 0.5 TiO 3 ceramic is a promising dielectric energy storage material due to its high spontaneous polarization (> 40 μC/cm 2 ) . Although many studies have been carried out to enhance the energy storage performance of Bi 0.5 Na 0.5 TiO 3 ceramic, achieving better energy storage performance is still a considerable challenge. Herein, Bi 0.5 Na 0.5 TiO 3 -BiYbO 3 -SrTiO 3 (BNT-BY-STO) relaxor ferroelectric ceramics were constructed, and <111>-oriented (1- x )(0.99BNT-0.01BY)- x STO ceramics were successfully fabricated by a templated grain growth method. The moderate energy storage performance (the reversible energy storage density of 3.26 J/cm 3 and energy storage efficiency of 76.3% under 290 kV/cm) can be achieved in <111>-oriented 0.8(0.99BNT-0.01BY)-0.2STO ceramics. The enhanced energy storage performance of textured BNT-BY-STO ceramics could be mainly attributed to the grain refinement of STO, and the improved breakdown strength and relaxation behavior caused by orientation engineering. These findings demonstrate that the co-doping of BY and STO and orientation engineering are effective strategies for improving the energy storage performance of BNT ceramic.
研究领域:
材料科学
·
电陶瓷
·
储能材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）