CERAMICS INTERNATIONAL
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2024
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IF 5.1
Xiaoxiao Zhou,Xiaoyan Peng,Haoyu Xu,Yijin Hao,Hezhang Li,Bo-ping Zhang
BiFeO 3 -BaTiO 3 (BF-BT) ceramics are an excellent choice for high-temperature lead-free piezoelectric ceramic due to their high Curie temperature and good piezoelectric properties , but the volatilization of Bi leads to the formation of A-site cationic vacancies and oxygen vacancies , culminating in heightened leakage currents and detrimental effects on piezoelectric properties. In this study, a chemical composition of 0.70Bi (1+ x ) Fe 0·97 Al 0·03 O 3 -0.30BaTiO 3 ceramics, abbreviated as B 1+ x FA-BT, where 0 ≤ x ≤ 0.05, were synthesized, with special attention on the effects of Bi compensation and poling process on their insulation and piezoelectric properties. Due to the coexistence of R - PC phases and low leakage current, B 1+ x FA-BT ceramics exhibit excellent piezoelectric properties and high Curie temperature, among which the B 1.02 FA-BT ceramic boasts optimal overall properties: d 33 = 196 pC N −1 , T C = 480 °C, k p = 34%, θ max = 49.5° and Q m = 32, under optimal poling parameters E p = 50 kV cm −1 and T p = 100 °C. The poling process is directly linked to the reorientation of domains, the redistribution of positive/negative space charge and the aggregation or injection of holes, which is achieved by tuning the poling field and temperature in a ceramic with optimal integrated piezoelectric properties. The poling process of BF-BT ceramics is significantly influenced by their leakage characteristics, which can have a significant impact on their overall performance. Optimizing electrical poling conditions and minimizing leakage current is crucial to achieving favorable piezoelectric properties in BF-BT ceramics with R - PC coexisting structures.
研究领域:
材料科学
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物理学
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产品关联
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2024
·Vol. 21
·期 3
·1688-1699
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IF 1.8
Xiangtai Guo,Yu Sun,Liangliang Liu,Zilong Yu,Juan Liu
BiFeO 3 -BaTiO 3 -based ceramics are promising multiferroic materials for a wide range of applications. In this paper, the effects of different ionic valence state((Ga 0.5 Ta 0.5 ) 4+ , Ta 5+ ) doping on the structure and properties of 0.73BiFeO 3 -0.27BaTi 1- y (Ga 1- x Ta x ) y O 3 ceramics were investigated. X-ray diffraction analysis showed that all samples were determined by rhombohedral R3c phase and tetragonal P4mm phase. A frequency-independent dielectric anomaly with obvious thermal hysteresis was detected in all samples, indicating the first-order ferroelectric phase transition, and the Curie temperatures were all above 600°C. The ferroelectric analysis found that the doping of donor element Ta reduced the coercive field, with a slight decrease of remanent polarization, which can be attributed to the soft effect of Ta element. Meanwhile, the magnetic properties were enhanced for all samples, with a maximum in 15T ( x = 1, y = .015) sample, where M r = .13 emu/g. According to relevant analysis, high-valence element substitution can enhance the magnetic properties and reduce the coercive field of BiFeO 3 , while low-valence element substitution can reduce dielectric loss. This result points out a way for us to choose appropriate doping elements to improve the performance of BiFeO 3 ceramics.
研究领域:
材料科学
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物理学
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2024
·Vol. 35
·期 7
·1-12
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IF 2.8
Xie Le-Tian,Zhou Xiao-Xiao,Tang Yu-Cheng,Yin Yang,Hao Yijin,Pei Jun,Zhang Bo-Ping
With the increasing demand for portable electronics, power electronics and other devices, energy storage materials with high power density and large energy storage density are becoming more and more important. BiFeO 3 -BaTiO 3 lead-free ferroelectric ceramics are deemed as a potential lead-free energy storage material due to their high spontaneous polarization and high Curie temperature. However, high remanent polarization has become a serious obstacle to its practical application. In this work, 0.67Bi (1- x ) Sm x FeO 3 -0.33BaTiO 3 (BS x F-BT, 0 ≤ x ≤ 0.10) was prepared by the conventional solid phase sintering method. The phase transforms from rhombohedral to pseudocubic, and the dielectric and electrical data reveal that relaxor ferroelectrics are favorable for achieving the small size polar nanoregions and enhanced relaxation behavior. Due to enhanced relaxation behavior by doping Sm 3+ , the recoverable energy storage density ( W rec ) reaches 1.99 J/cm 3 , and the energy storage efficiency ( η ) is 57% at a low electric field (190 kV/cm), which is higher than the undoped ceramic ( W rec = 0.272 J/cm 3 and η = 26%). This work also puts forward the concept of Ergodic relaxor ferroelectrics and Non-ergodic relaxor ferroelectrics to explain the improvement of energy storage performance.
研究领域:
材料科学
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物理学
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2021
·Vol. 32
·期 19
·24496-24506
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IF 2.478
Cheng Shuai,Zhang Bo-Ping,Wang Li-Jun,Yang Tao,Yuan Chang-Lai,Zhou Chang-Rong,Rao Guang-Hui,Yin Yang
The enhanced piezoelectric and ferroelectric properties of the tetragonal 0.67BiFeO 3 –0.33BaTiO 3 (BF–33BT) ceramics without MnO 2 doping or other dopants via tailoring sintering temperature ( T S ) and dwell time ( t d ) are reported. All ceramics crystallized in a single tetragonal phase, independent of the adopted T S and t d . As the T S or t d is increased, the BF–33BT ceramics show an increase in grain size and in relative density, while T S > 980 °C or t d > 6 h would result in more oxygen vacancies caused by Bi 3+ evaporation and/or reduction of Fe 3+ to Fe 2+ , along with a reduced relative density and an increased current leakage density. Because of the increased grain size, the higher relative density, and relatively less oxygen vacancies, high d 33 = 151 pC/N and P r = 25.9 μC/cm 2 were achieved in tetragonal BF–33BT ceramics with T S = 980 °C and t d = 6 h. In addition, large unipolar strain of 0.146% and \(d_{33}^{*}\) =326 pm/V (40 kV/cm), as well as high T C = 427 °C were also obtained in the BF–33BT ceramics with T S = 980 °C and t d = 6 h. Our studies indicate that the grain size, the relative density, and the oxygen vacancies play important roles for the piezoelectric properties of BF–33BT ceramics.
研究领域:
材料科学
·
物理学
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Jiyuan Chen,Feng Luo,Yuanshui Liu,Denghui Jiang,Linzhuang Xing,Zhimin Li
The lead-free BiFeO 3 -BaTiO 3 (BF-BT) based ceramics with large piezoelectric coefficient ( d 33 ) have been desired for promising applications in high-temperature fields. Herein, the 0.7Bi(Fe 0.9985 Mn 0.0015 )O 3 -0.3BaTiO 3 ceramics with different grain sizes are intentionally prepared by solid-state method, and a large d 33 (232 pC/N) and high Curie temperature T c (501 °C) are simultaneously achieved in the case of large grain size (>9 µm). X-ray diffraction and Rietveld refinement analyses indicate that these coarse-grained samples possess stronger rhombohedral distortion and enlarged lattice parameter compared to fine-grained samples, which make domain switching easier and give rise to the increase in strain. As a result, the piezoelectric and ferroelectric properties of such samples are significantly improved with increasing grain size from 3.05 µm to 9.07 µm. In addition, electric domain configuration and field-induced strain further prove that the strong piezoelectric response in coarse-grained samples is attributed mainly to enhanced non-180° domain mobility. This study reveals the origin of large piezoelectric response in coarse-grained BF-BT ceramics, and proposes an effective approach to improve the piezoelectric properties of BF-BT ceramics.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
Journal of Materiomics
·
2024
·
IF 8.4
Xiaoxiao Zhou,Yuxin Xu,Xiaoqi Gao,Chengchao Hu,Wan Jiang,Hezhang Li,Bo-Ping Zhang
BiFeO 3 –BaTiO 3 (BF–BT) ceramics exhibit higher piezoelectric coefficients ( d 33 ), Curie temperatures ( T C ), and temperature stability than other high-temperature lead-free piezoelectric materials. However, despite their crucial role in piezoelectric devices, the mechanical properties of BF–BT ceramics have been underexplored. A thorough evaluation of the mechanical properties of BF–BT is crucial for developing cost-effective and durable lead-free piezoelectric ceramics. Moreover, the specific causes of the high piezoelectric response and excellent temperature stability of BF–BT ceramics remain unclear owing to the instrumental detection threshold, which limits experimental studies to temperatures above 140 °C and below the degradation temperature of d 33 . To investigate the intrinsic origins of the high piezoelectricity and temperature stability of BF– x BT ceramics and to enhance their mechanical properties, a two-step sintering process is used to fabricate these ceramics (0.25 ≤ x ≤ 0.40). Owing to improvements in grain refinement and reduced Bi 3+ volatilization, the BF–0.33BT ceramic exhibits enhanced overall performance, with a modified small punch strength of 155 MPa, Vickers hardness of 5.2 GPa, a d 33 of 220 pC/N at room temperature, T C of 466 °C, and d 33 values exceeding 400 pC/N at 260 °C. Phase-field simulations, which address the limitations of device detection thresholds, reveal that with increasing temperature, the domain structure relaxes, and polarization intensity decreases. This indicates that changes in the high-temperature piezoelectric properties can be attributed to domain structure relaxation and the increase in dielectric constant. Overall, BF–BT ceramics exhibit superior piezoelectric performance, mechanical properties, and temperature stability, making them highly suitable for use in high-temperature and demanding environments.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Kai Liu,Rongxia Huang,Dijia Lin,Junhui Tan,Yejing Dai,Hua-Tay Lin
BiFeO 3 -BaTiO 3 ceramics exhibit excellent thermal stability and outstanding electrical properties in the morphotropic phase boundary (MPB) region, making them a prominent focus of research of lead-free piezoelectric ceramics. However, the conventional sintering process often results in Bi volatilization and changes in the valence state of Fe ions, leading to high leakage current and difficulty in achieving a piezoelectric coefficient above 200 pC/N. In this study, we fabricated 0.7BiFeO 3 -0.3BaTiO 3 -0.1 mol% MnCO 3 - x wt% Sc 2 O 3 (BFM-BT- x Sc) piezoelectric ceramics using a direct reaction sintering method. We investigated the microstructure, electrical properties, and thermal stability of the BFM-BT- x Sc ceramics. Compared to single Mn 2+ doping, the addition of Sc 3+ significantly refined the grain size, suppressed the transition of Fe 3+ to Fe 2+ , and reduced the concentration of oxygen vacancies, resulting in enhanced electrical properties of BFM-BT ceramics. The BFM-BT-0.2Sc ceramics exhibited excellent piezoelectric performance ( d 33 = 208 pC/N, d 33 = 400 pC/N at 308 °C) and a high Curie temperature ( T c = 502 °C), with a resistivity of 1.69 × 10 8 Ω cm at 200 °C. After optimizing the sintering temperature, the piezoelectric performance further improved, with d 33 reaching 228 pC/N, d 33 = 427 pC/N at 282 °C, and a resistivity of 5.9 × 10 8 Ω cm at 200 °C. These findings indicate that BFM-BT-0.2Sc ceramics possess excellent high-temperature electrical properties, suggesting broad prospects for the co-doping of Mn 2+ and Sc 3+ in BF-BT-based piezoelectric ceramics for high-temperature applications.
研究领域:
材料科学
·
无机非金属材料
·
电子材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）