JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2017
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IF 3.454
Xiaoyi Gao,Lianmeng Zhang,Chuanbin Wang,Qiang Shen
Textured Bi 5 Ti 3 FeO 15 (BTFO) ceramics were prepared by molten salt synthesis at 850 °C followed by plasma activated sintering at 800 °C. The structure and the anisotropic electrical and magnetic properties of the ceramics were investigated. The textured BTFO ceramics exhibited [001] preferred orientation with a high degree of texture fraction (Lotgering factor is 0.82), as confirmed from XRD patterns, FE-SEM and TEM micrographs. The anisotropic dielectric relaxation and conduction characteristics along the parallel and perpendicular directions were investigated using the dielectric and impedance spectroscopies. The grain boundary along the parallel direction had a similar value of capacitance to that of grains, whereas the grain boundary along the perpendicular direction dominated the resistive component. The magnetic performance along the perpendicular direction (H c ∼ 32.5 Oe) was better than that along the parallel direction (H c ∼ 17.6 Oe). These results could be useful for enhancing the electrical and magnetic properties of BTFO by texturization.
研究领域:
材料科学
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电子工程
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2022
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IF 6.364
Linjing Liu,Bin Yang,Shuai Yang,Qiangwei Kou,Hang Xie,Yuan Sun,Yunfei Chang,Shan-Tao Zhang,Fei Li
Grain-oriented Pb(Mg 1/3 Nb 2/3 )O 3 -PbZrO 3 -PbTiO 3 (PMN-PZ-PT) based ceramics were synthesized through templated grain growth via using BaTiO 3 (BT) templates. Although BT templates are partially destroyed by PMN-PZ-PT matrix, CuO addition remarkably promotes [001] c -oriented grain growth behavior of the ceramics, resulting in an improvement of Lotgering factor F 001 from ~86% to 98%. Both crystallographic texture and CuO doping increase tetragonality and reduce average domain size of the ceramics dominated by rhombohedral phase. Consequently, 0.50 wt% CuO-doped ceramics ( F 001 ~98%) exhibit optimum electromechanical properties: d 33 ~860 pC/N, d 33 × g 33 ~48.6 × 10 −12 m 2 /N, k p ~0.80, E c ~7.2 kV/cm, tan δ ~0.8% and T c ~222 °C. In addition to ~3.7 times and 6.6 times higher d 33 and d 33 × g 33 , those ceramics possess about 240% enhanced piezoelectric strain and much better thermal stability ( S max / E max variation ≤2% between RT and 150 °C) relative to non-textured counterpart. This work offers a good paradigm for simultaneously exploring high piezoelectric response and good temperature stability in piezoceramics, benefiting the development of next-generation advanced electromechanical devices.
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
MATERIALS CHEMISTRY AND PHYSICS
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2015
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IF 2.259
Gang Jian,Fang Meng,Dongxiang Zhou,Qiuyun Fu,Zhili Du,Chao Yan
A textured CoFe 2 O 4 ceramic was fabricated by reactive template grain growth (RTGG) method using rod-like α-FeOOH particles as templates. The template particles were synthesized by hydrothermal method , the particles showed good crystallization and rod-like shape with a diameter of 0.1–0.2 μm and an aspect ratio of 20–50. { ll0 } oriented CoFe 2 O 4 ceramic was obtained after a sintering process. The ceramic sintered at 1150 °C for 4 h showed dense and oriented structure with orientation degree of 0.89. Different magnetic hysteresis loops were observed along the in-plane and out-of-plane direction of the textured CoFe 2 O 4 , which was due to anisotropy properties of the sample. The textured ceramic exhibited an in-plane M s enhancement (355 emu/cm 3 ) compared to that of the non-textured ceramics (320 emu/cm 3 ) in the same sintering conditions.
研究领域:
材料科学
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磁性材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2024
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IF 11.2
Ruigang Qiu,Feifei Guo,Jie Wu,Wenqiang Bai,Yifei Chen,Hongqiao Zhou,Wei Long,Xiaojuan Li,Pinyang Fang,Zhonghua Dai,Jie Dong,Zengzhe Xi
In this work, texturing is proposed to improve the piezoelectric response of PSN-PMN-PT ceramics. The PSN-PMN-PT textured ceramic with a Lotgering factor F 001 higher than 99% was synthesized by the liquid-phase-assisted template grain growth (TGG) method. The addition of CuO/B 2 O 3 sintering aids improves the BT templates induced grain orientation growth behavior significantly. In comparison with its random counterpart, the Cu/B-T textured ceramic exhibits a high Lotgering factor F 001 of 99% and significantly enhanced dielectric and piezoelectric responses: ε r ∼ 3100, tan δ ∼ 0.8%, d 33 ∼ 1030 pC N –1 , d 33 ⋅ g 33 ∼ 34.2 × 10 –12 m 2 N –1 , d 33 * ∼ 1490 pm V –1 @5 kV cm –1 , S max ∼ 0.26%@20 kV cm –1 and H s ∼ 8.5%. In the meantime, good temperature stability is observed in the Cu/B-T textured ceramic with a variation of d 33 *@20 kV cm –1 and annealed d 33 lower than 9.68% and 18.1% over a wide temperature range of 25–140 °C. This work shows that PSN-PMN-PT textured ceramic (Cu/B-T) has great potential for electromechanical device applications such as precision actuators, ultrasound transducers, and energy harvesters.
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 ALLOYS AND COMPOUNDS
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2025
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IF 6.3
Xi Ouyang,Manwen Yao,Xi Yao,Tongqing Yang
The piezoelectric properties of lead-based ceramics can be enhanced by A -site doping with rare earth elements and texture engineering. However, the effects of defect engineering and the mechanism of enhancing the unipolar electrostrain need to be further explored. This study aims to investigate the microscopic properties and changes in defect dipoles in lead piezoceramics with Sm-doping and texture engineering. Specifically, temperature-dependent XRD and Raman tests showed that texture engineering exhibited remarkable structural stability, and a systematic test was conducted on the temperature stability of the piezoelectric constant d 33 , which fully confirmed a significant positive correlation between the temperature stability and the structural stability of the piezoceramics. Additionally, the epitaxial process induced a high density of interfacial defects due to lattice mismatch, which was analyzed by EPR testing. We observed a 41 % increase in the concentration of oxygen vacancies with texture engineering, but this was reduced by 19 % with 1 % Sm-doping. Furthermore, the buffer layer formed by Sm-doping helps to mitigate the rotation of the BO 6 octahedron during the epitaxy process, resulting in a 29 % reduction in Raman peak broadening. The changes in the defect dipole displacement polarizabilities after Sm-doping were also calculated through defect engineering. The mechanism of high unipolar electrostrain was explored by examining the variations between oxygen vacancy concentration, defect dipole displacement polarizabilities, internal bias field, asymmetry, and leakage current. These results demonstrate the feasibility of texture engineering for high electrostrain through defect engineering and have significant implications for optimizing the reliability of piezoelectric devices in high-temperature environments.
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Wanlong Wang,Rong Liu,Chen Dong,Yunmin Xie,Minlin Jiang,Guohua Dong,Hang Zhou
Aluminum-doped zinc oxide (AZO) is a promising substrate for perovskite solar cells (PSCs) because of its low cost, easy accessibility, and good conductivity. However, its relatively low transmittance with low resistance and inevitable reflectance loss makes it unfavorable for high-performance AZO-based PSCs. Herein, a simple and effective strategy that textures the surface of AZO substrate via a diluted HCl etching, is developed to boost PSC performance. The textured AZO substrate exhibits greater haze, higher transmittance, and lower reflectance for permitting more photons to reach and be absorbed within PSCs. In addition, the textured AZO substrate not only exhibits improved surface wettability that can enhance the buried interfacial contact and enable the growth of high-quality perovskite film, but also possesses reduced oxygen vacancies and lower work function (WF) that can suppress the recombination and reduce the energy barrier for electron extraction. As a result, the PSC on textured AZO substrate shows improved fill factor (FF, 70 %) and enhanced short-circuit current density (J sc , 23.7 mA/cm 2 ) compared with the reference cells (63 % and 21.1 mA/cm 2 ), yielding a much-increased power conversion efficiency (PCE) from 13.9 % to 17.6 %. The present work opens the door for the employment of AZO substrate in future commercialization of PSCs.
研究领域:
材料科学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）