Scientific Reports
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2017
·Vol. 7
·期 1
·1-8
·
IF 4.259
Lu Biao,Li Peilian,Tang Zhenhua,Yao Yingbang,Gao Xingsen,Kleemann Wolfgang,Lu Sheng-Guo
Both relaxor ferroelectric and antiferroelectric materials can individually demonstrate large electrocaloric effects (ECE). However, in order to further enhance the ECE it is crucial to find a material system, which can exhibit simultaneously both relaxor ferroelectric and antiferroelectric properties, or easily convert from one into another in terms of the compositional tailoring. Here we report on a system, in which the structure can readily change from antiferroelectric into relaxor ferroelectric and vice versa. To this end relaxor ferroelectric Pb 0.89 La 0.11 (Zr 0.7 Ti 0.3 ) 0.9725 O 3 and antiferroelectric Pb 0.93 La 0.07 (Zr 0.82 Ti 0.18 ) 0.9825 O 3 ceramics were designed near the antiferroelectric-ferroelectric phase boundary line in the La 2 O 3 -PbZrO 3 -PbTiO 3 phase diagram. Conventional solid state reaction processing was used to prepare the two compositions. The ECE properties were deduced from Maxwell relations and Landau-Ginzburg-Devonshire (LGD) phenomenological theory, respectively, and also directly controlled by a computer and measured by thermometry. Large electrocaloric efficiencies were obtained and comparable with the results calculated via the phenomenological theory. Results show great potential in achieving large cooling power as refrigerants.
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
CERAMICS INTERNATIONAL
·
2025
·Vol. 52
·期 1
·420-428
·
IF 5.6
Junjie Zang,Laijun Liu,Xiuyun Lei,Congling Yin
A series of Aurivillius-type Sr x Ba 1-x Bi 2 Ta 2 O 9 (SBBT, x = 0–1) ceramics were synthesized using a conventional solid-state reaction route and systematically investigated concerning their crystal structure and ferroelectric properties. High-resolution synchrotron XRD refinements indicate that BaBi 2 Ta 2 O 9 crystallizes in the polar A 2 1 am space group rather than I 4/ mmm , confirming the presence of local non-centrosymmetric distortions. A thermal-driven phase transition from orthorhombic to tetragonal is proposed for BBT. The disorder of Ba/Bi cations occurs in BaBi 2 Ta 2 O 9 . Increasing Sr-doping level tends to decrease the orthorhombic structural distortion of Sr x Ba 1-x Bi 2 Ta 2 O 9 . Raman spectroscopy reveals a redshift of the 840 cm −1 band with increasing Sr content x, consistent with the elongated minimum Ta-O distance within TaO 6 octahedra. The x = 0–0.4 compositions exhibit strong dielectric frequency dispersion, while the x = 0.8–1 samples display frequency-independent sharp dielectric peaks. Low-x compositions exhibit pinched P - E loops characteristic of relaxors, whereas high-x samples display squared P - E loops indicative of normal ferroelectrics. Vogel-Fulcher analysis and a phenomenological model reveal that Sr doping suppresses the dynamics of polar nano-region (PNRs) and increases their size across the x = 0–0.4 sample. These phenomena confirm a transition from relaxor to normal ferroelectricity in the SBBT system introduced by increasing Sr-doping level. This work provides new insights into the structure-property correlations in Aurivillius-phase relaxor ferroelectrics, offering guidance for the high-performance energy-storage materials design.
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DOI
高影响因子
Crystals
·
2020
·Vol. 10
·期 9
·733
·
IF 2.404
Qixiang Wang,Hong Fang,Di Wang,Jie Wang,Nana Zhang,Bin He,Weiming Lü
The fabrication and transfer of freestanding single-crystal ferroelectric membranes deserve intensive investigations as to their potential applications in flexible wearable devices, such as flexible data storage devices and varied sensors in E-skin configurations. In this report, we have shown a comprehensive study approach to the acquisition of a large-area freestanding single-crystal ferroelectric BaTiO3by the Sr3Al2O6scarification layer method. By controlling the thickness of the BaTiO3and Sr3Al2O6, the exposed area of the Sr3Al2O6interlayer, and the utilization of an additional electrode La2/3Sr1/3MnO3layer, the crack density on the freestanding BaTiO3can be dramatically decreased from 24.53% to almost none; then, a more than 700 × 530 μm2area high-quality freestanding BaTiO3membrane can be achieved. Our results offer a clear and repeatable technology routine for the acquisition of a flexible large-area ferroelectric membrane, which should be instructive to other transition metal oxides as well. Our study can confidently boost flexible device fabrication based on single-crystal transition metal oxides.Keywords:crack density;ferroelectrics;freestanding;single crystal
研究领域:
材料科学
·
柔性电子学
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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
·
能源技术
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DOI
PubMed
高影响因子
Nanophotonics
·
2019
·Vol. 8
·期 12
·2215-2223
·
IF 6.908
Er Pan,Gongxun Bai,Yutao Peng,Liang Chen,Shiqing Xu
Ferroelectric oxide nanocrystals, in combination with the robust coupling of an electric field with crystal structure symmetry, makes such systems agreeable to field-induced crystal structural transformation. The luminescent properties of rare earth ions are sensitive to the symmetry of the surrounding crystal field. The luminescence tuning of rare earth ions is an important assignment in the research of luminescent materials. However, the current conditional feasibility and reversibility in the exploration of luminescence modification remain major challenges. In this article, the luminescence modulation of rare earth ions has been developed in Yb 3+ /Er 3+ codoped ferroelectrics glass ceramics containing Bi 4 Ti 3 O 12 nanocrystals through an electric field. The inclusion of nanocrystals in the glass matrix greatly enhances the electrical resistance. Both upconversion and near-infrared emissions of rare earth ions are effectively enhanced more than twice via polarization engineering. The electric field regulates the photonic properties of rare earth ions with excellent reversibility and nonvolatility in ferroelectrics. The effective modification by electric field provides a new scheme for optical storage and optoelectronic devices.
研究领域:
材料科学
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光学工程
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DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2016
·Vol. 100
·期 1
·265-275
·
IF 2.787
Longwen Wu,Xiaohui Wang,Zhengbo Shen,Longtu Li
The (1− x )BaTiO 3 – x Bi(Zn 2/3 Nb 1/3 )O 3 ( x = 0.01–0.30) ceramics were synthesized by solid-state reactions. The solubility limit was determined to be x = 0.20. A systematic structural transition from a tetragonal phase ( x ≤ 0.034), to a mixture of tetragonal and rhombohedral phases (0.038 ≤ x ≤ 0.20), and finally to a pseudocubic phase ( x ≥ 0.22) at room temperature was identified. Dielectric measurement revealed a ferroelectric ( x ≤ 0.04) to relaxor ( x ≥ 0.06) transition with permittivity peak broadening and flattening, which was further verified by Raman spectroscopy and differential scanning calorimetry (DSC). Activation energies obtained from the Vogel–Fulcher model displayed an increasing trend from ~0.03 eV for x ~ 0.05, to unusually high values (>0.20 eV) for the compositions with x ≥ 0.15. With the increase in Bi(Zn 2/3 Nb 1/3 )O 3 content, the polarization hysteresis demonstrated a tendency from high nonlinearity to sublinearity coupled with the reduction in remnant polarization and coervice field. The deconvolution of the irreversible/reversible polarization contribution was enabled by first-order reversal curve distributions, which indicates that the decreasing polarization nonlinearity with the increase in Bi(Zn 2/3 Nb 1/3 )O 3 concentration could be related with the change from the ferroelectric domain and domain wall contributions to the weakly coupled relaxor behaviors.
研究领域:
材料科学
·
物理学
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DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·Vol. 107
·期 9
·6215-6223
·
IF 3.5
Ye Lu,Ji Zhang,Xinyi Zhao,Kedong Zhou,Lei He
Dielectric capacitors, which can achieve tremendous power density and ultrafast charge/discharge speed, are crucial components for high power equipment. Yet, the synchronous achievement in high recoverable energy density ( W rec ) and high efficiency ( η ) is a long-term difficulty for dielectric ceramics. Herein, the (0.85 − x )NaNbO 3 –0.15BaTiO 3 – x Bi(Mg 1/3 Ta 2/3 )O 3 (NN–BT– x BMT) relaxor ferroelectric ceramics were proposed and studied. The doping of BMT was conducive to promoting the microstructure and bandgap and improving the dielectric relaxation properties of NN–BT ceramics. Finally, the sample of x = 0.10 presented a high W rec of 5.9 J/cm 3 and a high η of 90% simultaneously. In addition, the sample also exhibited superb charge/discharge performances with large power density ( P D = 137 MW/cm 3 ) and fast charge/discharge speed ( t 0.9 = 39 ns). The above results reveal that the NaNbO 3 -based ceramics could serve as potential alternatives for advanced dielectric capacitors.
研究领域:
材料科学
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电子工程
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2022
·Vol. 33
·期 10
·7621-7635
·
IF 2.779
Meng Ke,Li Wenhua,Zhang Yansong,Zhang Siyuan,Tang Xingui,Guo Xiaobin,Jiang Yanping
Based on the design from the view of the Goldschmidt tolerance factor, Ba 0.955 La 0.03 TiO 3 -doped Zr ferroelectric ceramics were prepared by solid-state reaction method. The experimental results show that our hypothesis does adjust the thermal stability Ba 0.955 La 0.03 TiO 3 ferroelectric ceramics. The findings can be supported by the actual results of the following characterization methods. Room-temperature X-ray diffraction and field emission scanning microscopy demonstrate that the crystallization of these ceramics is good. The essential dielectric properties, electrical conductivity, impedance spectroscopy, and electrical modulus of ceramics were measured. Besides, impedance spectroscopy and electrical modulus spectrum indicated that the high-temperature dielectric relaxation behavior is related to the oxygen vacancies.
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
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Longbin Chen,Pengqi Hai,Yaodong Yang,Chao Wu,Yongming Hu,Wei-Feng Rao
Combining metal with ferroelectrics is one of the reliable strategies to enhance the photocatalytic water splitting of ferroelectrics dramatically. However, the metal loading ratio is directly related to the synergistic effect of catalysts. In order to find the appropriate loading of Pt, we fabricated SrBi 4 Ti 4 O 15 (SBTO) nanosheets (NSs) and deposited different amounts of Pt nanoparticles (NPs) to form heterojunction. The optoelectronic characterizations verified that the Pt-modified SBTO NSs have broadened absorption of visible light; produce more long-lived charge carriers. The photocatalytic hydrogen production can reach 11700 μmol g −1 under continuous illumination for 3 h from the sample containing 6 wt% Pt, showing a much higher hydrogen evolution rate than other ferroelectric materials under similar reaction systems. Our work provides a valuable and feasible solution to produce hydrogen from water.
研究领域:
材料科学
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能源科学
·
光催化
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DOI
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Qinqiang Guo,Zhonghua Dai,Chenxi Liu,Yuanyuan Zheng,Xin Zhao,Weiguo Liu,Yu Cong,Shuitao Gu
The energy issue is currently a highly significant topic of concern, and the development of environmentally friendly and high-performance lead-free energy storage devices is fundamental to solving energy problems, but it also poses challenges. Lead-free environmentally friendly (Bi 0.5 Na 0.5 )TiO 3 [BNT] has attracted widespread attention due to its high polarization, but its low efficiency greatly affects its practical application. In this study, 1- x (Bi 0.5 Na 0.5 )TiO 3 - x Ca(Ti 0.8 Ta 0.16 )O 3 [1- x BNT- x CTT]ceramics were prepared to investigate the relationship between their microstructure and macro energy storage properties. With the introduction of CTT, the long-range order was broken, reducing the grain size; the introduction of high bandgap energy Ta 2 O 5 reduced residual polarization and improved the energy storage efficiency of the ceramics. Finally, high energy storage ( W rec = 3.01 J/cm 3 ) and high energy storage efficiency ( ƞ = 90 %) were achieved in the 0.7BNT-0.3CTT ceramics, and the breakdown field strength was increased to 350 kV/cm, with excellent discharge performance ( P D of 28.97 MW/cm 3 , t 0.9 of 1.9 μs). This study explores lead-free relaxor ferroelectric energy storage capacitors with high efficiency under high electric fields, providing a new approach to optimize the energy storage performance of ceramic energy storage devices.
研究领域:
材料科学
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能源存储
·
电子工程
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产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2023
·
IF 5.7
Mengdi Cheng,Mo Zhao,Shiyi Zhang,Yangxi Yan,Zhimin Li,Pangpang Wang,Ri-Ichi Murakami,Dongyan Zhang
High-performance piezoelectric materials are widely used in electromechanical applications such as sensors, actuators, and transducers. Herein, improvement in electrical properties of Pb(Ni 1/3 Nb 2/3 )O 3 −Pb(In 1/2 Nb 1/2 )O 3 −PbTiO 3 relaxor ferroelectrics by modulating the polymorphism of nano-scale domain is reported, and piezoelectric coefficients d 33 and d 33 * as high as 948 pC/N and 1108 pm/V, respectively, are achieved. The high piezoelectric response is elucidated by combining cryogenic dielectric , Rayleigh analysis, and scanning electron microscopy with piezoresponse force microscope. During the transition from the tetragonal to rhombohedral phase, the morphology of the ferroelectric domains changes significantly, mesoscopic domain destruction is observed, and thus nano-scale domains appear as an extrinsic contribution of piezoelectricity. In addition, nano-scale domains promote polarization rotation, thus, improving the piezoelectric response. The improved piezoelectric performance demonstrates good thermal stability, retaining the inverse piezoelectric coefficient of approximately 1000 pm/V near 70 °C. This work provides a good example of improving ceramics' piezoelectric response by modulating the polymorphism of nanoscale domains.
研究领域:
材料科学
·
物理学
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Xiao Wu,Peng Wang,Xingan Jiang,Shuyao Cao,Jinfeng Lin,Rui Xiong,Zhenhuan Zheng,Min Gao,Chunlin Zhao,Tengfei Lin,Cong Lin,Baisheng Sa
Photoferroelectrics that involve strong light-matter coupling are regarded as promising candidates for realizing bulk photovoltaic and photoelectric effects via light absorption. Nonetheless, understanding the photoresponse mechanism or modulation of performance from a microscopic point of view is scarcely explored through quantification of macroscopic properties. Herein, we design a model material, Gd3+-doped (K0.5Na0.5)NbO3 ferroelectric-transparent ceramics, and present an advantageous strategy to enhance the optoelectronic coupling through joint modulations of lattice distortion and oxygen vacancies, along with inner defects and ferroelectric domains. Significantly, their microcosmic manipulation can be intuitively and facilely evaluated by the optical transparency of each ceramic. An approximately 104 fold increase in conductivity under ultraviolet irradiation was produced. Under the cocoupling between external physical fields, the synergy of photoelectric stimulation increased the photoconductivity of the ceramics by 13.89 times. Additionally, a significant increase (4.5-fold) in the current output from the photovoltaic effect was achieved via ferroelectric domains of moderate size, whose size could be easily assessed by optical transmittance. In situ microscopic observations confirmed that the configuration of oxygen vacancy-dependent ferroelectric domains contributes to the enhanced optoelectronic response. This research provides a distinct way to develop inexpensive optocoupler devices and meet the requirements for multifunctional integration in single photoferroelectrics.
研究领域:
材料科学
·
光学
·
电子工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）