CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Jiajiu Li,Rongxia Huang,Congfei Peng,Yejing Dai,Shunjin Xiong,Chunhui Cai,Hua-Tay Lin
In this study, plate-like Na 0.5 Bi 0.5 TiO 3 (BNT) templates with perovskite structure were obtained by two-step molten salt synthesis (MSS) method at a low temperature. Firstly, Bi 4 Ti 3 O 12 precursors were synthesized at 1030 °C in NaCl–KCl molten salt. Secondly, plate-like Na 0.5 Bi 0.5 TiO 3 particles with perovskite structure were obtained from plate-like layer-structured ferroelectric ceramic of Bi 4 Ti 3 O 12 by topochemical microcrystal conversion method. Result showed that excessive Na 2 CO 3 was beneficial to facilitate the low temperature synthesis. In the case of an excess of 30 mol% Na 2 CO 3 , plate-like BNT particles could be obtained by synthesis at temperatures ranging from 760 °C to 800 °C, which indicated a flexible processing route. Also, it has been observed that plate-like BNT particles show a high aspect ratio with 1 μm in thickness and 10–20 μm in length. These Na 0.5 Bi 0.5 TiO 3 plate-like particles can be good candidates for the preparation of lead-free BNT-based piezoelectric ceramics with oriented grain microstructure.
研究领域:
材料科学
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无机化学
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Xingyu Shi,Li Li,Qingqing Zhu,Cheng Chen,Chunchang Wang
The emergence of piezo-photocatalysis inaugurates a nascent approach aimed at mitigating the rapid recombination of electrons and holes, thus augmenting catalytic efficacy. This work endeavors to fabricate Na 0.5 Bi 0.5 TiO 3 (BNT) nanosphere powders through a simplified hydrothermal method , whereby precise control over the quantity of tetrabutyl titanate , a titanium source, is employed. The piezo-photocatalytic performance of BNT nanospheres is meticulously scrutinized through the degradation of Rhodamine B (RhB) at a concentration of 5 mg/L, utilizing ultrasonic vibration and UV–visible light irradiation . Remarkably, the appropriate oxygen vacancies exerts a profound impact on the efficiency of piezoelectric photocatalytic degradation. Among the investigated catalysts, The material with the best performance exhibits the highest rate of piezo-photocatalytic degradation, boasting a rate constant (k value) of 0.052 min −1 . Furthermore, the BNT nanospheres exhibit commendable stability and reusability in the context of piezo-photocatalytic degradation. Elucidation of the piezo-photocatalytic mechanism of BNT nanospheres is attained through the identification of radicals and intermediates present in the degradation process . This research imparts invaluable guidance for the design and development of state-of-the-art and high-performance piezo-photocatalytic catalysts.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
Materials
·
2022
·Vol. 15
·期 17
·5881
·
IF 3.748
Yuleng Jiang,Xiang Niu,Wei Liang,Xiaodong Jian,Hongwei Shi,Feng Li,Yang Zhang,Ting Wang,Weiping Gong,Xiaobo Zhao,Yingbang Yao,Tao Tao,Bo Liang,Shengguo Lu
Owing to the high power density, excellent operational stability and fast charge/discharge rate, and environmental friendliness, the lead-free Na0.5Bi0.5TiO3(NBT)-based relaxor ferroelectrics exhibit great potential in pulsed power capacitors. Herein, novel lead-free (1−x)(0.7Na0.5Bi0.5TiO3-0.3Sr0.7Bi0.2TiO3)-xBi(Mg0.5Zr0.5)O3(NBT-SBT-xBMZ) relaxor ferroelectric ceramics were successfully fabricated using a solid-state reaction method and designed via compositional tailoring. The microstructure, dielectric properties, ferroelectric properties, and energy storage performance were investigated. The results indicate that appropriate Bi(Mg0.5Zr0.5)O3content can effectively enhance the relaxor ferroelectric characteristics and improve the dielectric breakdown strength by forming fine grain sizes and diminishing oxygen vacancy concentrations. Therefore, the optimalWrecof 6.75 J/cm3and aηof 79.44% were simultaneously obtained in NBT-SBT-0.15BMZ at 20 °C and 385 kV/cm. Meanwhile, thermal stability (20–180 °C) and frequency stability (1–200 Hz) associated with the ultrafast discharge time of ~49.1 ns were also procured in the same composition, providing a promising material system for applications in power pulse devices.Keywords:Na0.5Bi0.5TiO3;lead-free;relaxor ferroelectrics;compositional tailoring;energy storage
研究领域:
材料科学
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能源技术
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DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Liang Wang,Jindong Dou,Yaodong Yang,Jianting Li,Wei-Feng Rao
Sonocatalysis has received much attention due to its ability to completely degrade organic matter without secondary contamination. However, there are still different opinions about the factors affecting sonocatalysis, such as the role of the piezoelectric coefficient in the sonocatalytic process needs to be clarified. To understand the influence of piezoelectric coefficient, Na 0.5 Bi 0.5 TiO 3 -xSrTiO 3 (NBT-xST, 0.20 ≤x ≤ 0.30) with different piezoelectric coefficients and different phase states (ferroelectric phase/relaxor) were obtained. The sonocatalytic experiments revealed a significant correlation between the piezoelectric coefficient and the catalytic performance in the ferroelectric phase. Still, more influencing factors need to be considered in the relaxor region.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Lu Shi,Chunxiao Lu,Lirong Chen,Qiwei Zhang,Yong Li,Tiejun Zhang,Xihong Hao
Piezocatalysis has been considered as a promising technology in water pollution treatment. In this work, a series of piezoelectric Na 0.5 Bi 0.5 TiO 3 (NBT) nanoparticles were prepared by hydrothermal method using different titanium sources as titanium precursors. The piezocatalytic performances of the NBT nanoparticles were investigated by the degradation of Rhodamine B (RhB) with the concentration of 10 mg/L under ultrasonic vibration. It is found that the NBT nanoparticles prepared by using anatase titanium oxide as titanium precursor show optimum piezocatalytic activity and the rate constant of 0.022 min −1 is achieved for RhB. The initial RhB concentration, ultrasonic power, particles size and specific surface area of NBT materials play an important role in optimizing the piezocatalytic performance. Moreover, the NBT nanoparticles show a satisfactory stability and reusability for the piezocatalytic degradation. The piezocatalytic mechanism of NBT nanoparticles was elucidated by the identification of free radicals and intermediates in the degradation process. The work provides a guidance to design and develop new high-performance piezocatalysts.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2023
·Vol. 107
·期 4
·2360-2370
·
IF 3.9
Zhemin Chen,Yongping Pu,Yating Ning,Yiting Hui,Chunhui Wu,Lei Zhang,Xuqing Zhang,Bo Wang
Eco-friendly ceramic capacitors gradually become an important section of pulsed power devices. However, the synchronous realization of ultra-high energy storage density ( W rec > 6 J/cm 3 ) and efficiency ( η > 90%) is difficult. Thus, a novel multiscale amelioration strategy in Na 0.5 Bi 0.5 TiO 3 -based ceramics is proposed to achieve ultra-high energy storage density and efficiency. The multiscale amelioration strategy for (Na 0.5 Bi 0.47 La 0.03 ) 0.94 Ba 0.06 TiO 3 (NBLBT) ceramic focuses on grain size, bandgap width, and dielectric relaxor behavior, which can be regulated by introducing Sr(Al 0.5 Nb 0.25 Ta 0.25 )O 3 (SANT). On the one hand, the refined grain size and increased bandgap width are conducive to improving the breakdown strength. On the other hand, the optimized dielectric relaxation behavior is beneficial to suppress the remanent polarization. Accordingly, an ultrahigh W rec = 6.89 J/cm 3 and η = 90.1% are simultaneously achieved in 0.84NBLBT- 0.16SANT ceramic. In addition, the sample synchronously possesses excellent thermal and frequency stability (a variation within 5% in W rec and η ), transient discharge rate of t 0.9 ∼ 78.8 ns and a high-power density of P D ∼ 114.5 MW/cm 3 . This study provides an effective strategy to further develop pulsed power devices.
研究领域:
材料科学
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能源工程
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Yuanyuan Chen,Honghui Zhang,Xinying Zhu,Hucheng Zhou
The Na 0.5 Bi 0.5 TiO 3 and Na 0.5 Bi 0.5 TiO 3 @C core-shell catalysts were synthesized successfully using the solvothermal method. A few of Ti 4+ was reduced to Ti 3+ with the help of glucose in the solvothermal process, which results in the formation of oxygen vacancies in the NBT@C catalysts. Meanwhile, the excessive glucose was carbonized, which accumulated on the surface of Na 0.5 Bi 0.5 TiO 3 and formed Na 0.5 Bi 0.5 TiO 3 @C core-shell composites. The phase, microstructure, optical and piezoelectric properties , as well as the catalytic activities of the synthesized catalysts were characterized. The Na 0.5 Bi 0.5 TiO 3 @C core-shell composites show higher photocatalytic activity that of pure Na 0.5 Bi 0.5 TiO 3 on account of more visible light absorbance. And the piezo-photocatalytic activities to tetracycline of the synthesized catalysts are highest due to the synergetic effects of photocatalysis and piezocatalysis.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
International Journal of Electrochemical Science
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2023
·
IF 1.5
Shuangshuang Yue,Baoquan Wan,Haiyu Li,Yunying Liu,Qiwei Zhang
Ferroelectric/polymer composites capable of possessing high dielectric constant, excellent flexibility and withstanding high electric field have been considered as promising candidates for embedded capacitor applications, or other energy storage/transfer devices. However, conventional ferroelectric particle composites only exhibit high dielectric enhancement at a high fraction, and cannot withstand high breakdown electric fields. Compared with particle fillers, the plate-like ferroelectrics with obvious anisotropic dielectric behaviors exhibit excellent dielectric properties in a co-plane orientation. Here we reported a new polyimide based composite material with the (200) oriented plate-like Na 0.5 Bi 0.5 TiO 3 powders as fillers. The results showed that the plate-like Na 0.5 Bi 0.5 TiO 3 fillers lead to a obviously increase of dielectric constant for polyimide composites (ε r =14.00) at a very low content when Na 0.5 Bi 0.5 TiO 3 content is about 5 wt%, which is 4.03 times as large as that of pure polyimide (ε r =3.47) while maintaining a relatively low loss (tgδ=0.0061) and high breakdown strength (1412 kV/cm). The measured energy density with 5 wt% Na 0.5 Bi 0.5 TiO 3 content increased to a value of 1.24 J/cm 3 , higher than that of pure polyimide (0.67 J/cm 3 ). The result indicates that the composite could have potential applications in embedded capacitors and microelectronic applications.
研究领域:
材料科学
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电气工程
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2021
·
IF 5.316
Guoliang Xue,Xuefan Zhou,Zhongna Yan,Gang Liu,Hang Luo,Dou Zhang
Nowadays, it remains a challenge to achieve a simultaneous improvement of dielectric constant, energy density, and temperature stability in dielectric ceramics . In this work, it was found that such drawback could be effectively resolved by using KTaO 3 to substitute Na 0.5 Bi 0.5 TiO 3 . In (1- x )Na 0.5 Bi 0.5 TiO 3 - x KTaO 3 ceramics, the temperature coefficient of capacitance (TCC) of x = 0.10 composition is lower than 15% in the temperature range of 25–390 °C, with a high dielectric constant of 2008 and a low dielectric loss of 0.0044 at 150 °C. Meanwhile, a large discharged energy density of ~2.50 J/cm 3 with the variation less than± 3% in 5–190 °C was obtained under a low electric field of 18 kV/mm in x = 0.20 composition, accompanied with a high energy efficiency of> 80%. These results reveal that this ceramic system is a promising candidate for temperature-stable dielectric and energy storage capacitors applications.
研究领域:
材料科学
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电子工程
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DOI
高影响因子
OPTICS LETTERS
·
2016
·Vol. 41
·期 16
·3803-3805
·
IF 3.04
Hong Zhou,Xiaoxia Wang,Xiujuan Zhuang,Anlian Pan
Nanowires with nonlinear optical properties such as second harmonic generation (SHG) are essential elements for an all-optical integrated photonic circuit. However, the existing materials face challenges for applications in a wide wavelength range. To cope with the challenges, ferroelectric nanowires are considered promising candidates, especially for SHG applications. In this Letter, we study SHG and waveguide properties in perovskite Na0.5Bi0.5TiO3 (NBT) nanowires. Strong SHG is observed in NBT nanowires illuminated by a 1064 nm laser radiation. For the waveguide studies, these NBT nanowires show a waveguide propagation loss as low as 0.01 dB/μm at 532 nm. This work suggests potential applications in future integrated optics with NBT nanowires.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
Crystals
·
2019
·Vol. 9
·期 4
·206
·
IF 2.061
Nannan Dong,Xiaoyi Gao,Fangquan Xia,Hanxing Liu,Hua Hao,Shujun Zhang
This work provides a comparative study of the dielectric and piezoelectric properties of randomly oriented and textured 0.88Na0.5Bi0.5TiO3-0.08K0.5Bi0.5TiO3-0.04BaTiO3(88NBT) ceramics. Textured ceramics were fabricated by template grain growth (TGG) method using NaNbO3(NN) for templates. For textured ceramics with 4 wt% NN templates, a Lotgering factor of 96% and piezoelectric coefficientd33of 185 pC/N were obtained. Compared to the randomly oriented ceramics, textured ceramics show lower strain hysteresis (H= 7.6%), higher unipolar strain of 0.041% with corresponding large signal piezoelectric coefficientd33*of 200 pm/V at applied field of 2 kV/mm. This enhancement can be explained by the grain orientation along <001> direction by texturing, where an engineered domain configuration is formed after polarization, leading to decreased hysteresis and increased piezoelectric property.Keywords:textured ceramics;template grain growth;piezoelectric materials;electrical conductivity
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 THE AMERICAN CERAMIC SOCIETY
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2020
·Vol. 103
·期 11
·6308-6318
·
IF 3.502
Aditya Jain,Yingang Wang,Hao Guo,Neng Wang
Novel lead-free diphasic (1- x )Ba 0.9 Sr 0.1 Ti 0.9 Hf 0.1 O 3 - x Na 0.5 Bi 0.5 TiO 3 (BSTH-NBT) ceramic nanocomposites were synthesized via an economically viable modified mechano-chemical activation technique. In the present investigation, we have developed an energy storage composite material by systematically optimizing the charge transport behavior and charge storage characteristics between the ferroelectric BSTH and piezoelectric NBT phase. The composite with x = 0.09 NBT concentration has shown the best energy storage properties with 1.61 J/cm 3 discharge energy density along with 80.1% energy efficiency. The BSTH and NBT had a synergetic effect on the ferroelectric properties of the composites. The improvement in ferroelectric and piezoelectric properties along with excellent aging characteristics in composite materials is mainly attributed to enhancement in microstructural density, grain boundary interface, and stress effects. The improved dispersibility and excellent compatibility between BSTH and NBT phase have resulted in approximately 20% enhancement in breakdown strength of composite compared to pure BSTH ceramic.
研究领域:
材料科学
·
能源工程
✓ 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）