CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Lingfang Xu,Yu Zhang,Chi Gui,Hanshuo Fang,Ruilong Wang,Haibo Xiao,Shiheng Liang,Changping Yang
BiFeO 3 has been extensively studied as an important single-phase multiferroic material at room temperature in the application fields of energy storage, data storage, spintronics, and electro-magnetic sensors. However, the high leakage current caused by the presence of lattice defects such as vacancies constrains the further development of BiFeO 3 . In this paper, we presented a facile method to overcome the high leakage problem via blending BiFeO 3 nanoparticles into the ferroelectric copolymer PVDF-TrFE matrix and introducing a barrier layer beneath the top Pt dot electrode. The leakage current and ferroelectric characteristics of BiFeO 3 _PVDF-TrFE nanocomposite films were discussed comprehensively. Consequently, compared with the composites without the barrier layer, the leakage current density of the BiFeO 3 _PVDF-TrFE composite films reduced two orders of magnitude after coating a pure copolymer layer. Moreover, the remnant ferroelectric polarization reached ~14 μC cm −2 for a moderate weight content (25 wt%) of BiFeO 3 nanoparticle in the blends, with a remarkably smaller coercive electric field than that of pure PVDF-TrFE films. An electrical conduction blocking mechanism was established to elucidate the optimized electric and ferroelectric properties of nanocomposite films.
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
JOURNAL OF APPLIED PHYSICS
·
2021
·Vol. 130
·期 14
·
IF 2.546
Peng Xiao-Yan,Tang Yu-Cheng,Zhang Bo-Ping,Zhu Li-Feng,Xun Bo-Wei,Yu Jing-Ru
BiFeO 3 -BaTiO 3 is a promising high-temperature lead-free piezo-ceramics due to its high Curie temperature ( T C > 500 °C) and excellent piezoelectric properties. However, a high leakage current was often detected in this system, which severely affects its applications. In this work, the 0.7BiFe (1− x ) Ga x O 3 -0.3BaTiO 3 (BFGa x -BT, 0.00 ≤ x ≤ 0.10) system was designed to reveal the reason of leakage-current density decreased by their leakage mechanism. Because of the suppression of generation of Fe 2+ and oxygen vacancy ( V O ∙ ∙ ), the leakage mechanism from space charge limited conduction mechanism found in Ga-free BF-BT ceramics turns into Ohmic conduction and Schottky emission mechanism as Fe 3+ was replaced with Ga 3+ . A good combination of piezoelectric properties ( d 33 = 174 pC N −1 and k p = 29%) and high Curie temperature ( T C = 497 °C) was achieved in the BFGa0.06-BT ceramic owning the lowest leakage-current density. This work will provide the clues for preparing the high insulation and high piezoelectric performance BF-BT-based ceramics by suppressing the valence change of Fe 3+ and V O ∙ ∙ appearance.
研究领域:
材料科学
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
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
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Dan Xu,Wenjie Zhao,Wenping Cao,Weili Li,Weidong Fei
The lead-free BiFe 1- x (Li 0·5 Nb 0.5 ) x O 3 ceramics with x = 0.00, 0.01, 0.02, 0.04, 0.06, and 0.08 were modified by Li/Nb co-doping. X-ray diffraction measurements indicated that all the ceramics had a rhombohedral distorted perovskite structure and secondary phases appeared when x = 0.00, 0.04, and 0.06. The BiFeO 3 ceramics with a small amount of Li/Nb co-doping exhibited improvements in the remnant polarization (2 P r ) and ferroelectric P - E loop shape compared with the results of pure BiFeO 3 (BFO). The decreased dielectric loss and leakage current indicated that proper Li/Nb co-doping for the Fe-site in BFO was a promising route to improve the leakage behavior and enhance the resistivity. These improved electrical properties were related to the reduction of oxygen vacancies and suppression of the formation of Fe 2+ . The leakage mechanism was also discussed and analyzed.
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
·
IF 3.83
Jianhua Zhu,Qian Xiao,Ting Zhang,Yefeng Yin,Yang Liu
The effects of acceptor dopant (typical Mn 2+ ) and donor dopant (typical V 5+ ) on the reliability of Li 2 ZnTi 3 O 8 based low temperature co-fired ceramics (LTCC, in short) have been investigated. Large difference occurs among different types of dopants. V 5+ doping decreases the breakdown voltage of the multilayer capacitors which were manufactured by low temperature sintered Li 2 ZnTi 3 O 8 ceramics, however, Mn 2+ doping increases the breakdown voltage and lowers down the leakage current significantly. This may very likely due to the fact that donor induces the generation of weak bound electrons while acceptor capture the weak bound electrons. The results suggest that Mn 2+ is a very effective additive for improving the reliability of low temperature sintered Li 2 ZnTi 3 O 8 ceramics.
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
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Yefeng Feng,Peiyao Chen,Bingshuang Mao,Maolin Bo,Qihuang Deng
Ultrahigh dielectric constant is obtained in polymer/MXene composites due to percolation . However, huge dielectric loss is triggered owing to high leakage current . In this work, hybrid filler consisting of Ti 2 C MXene and ZrO 2 was prepared for coordinating high dielectric constant and low dielectric loss in composites. Instead of Ti 2 C percolation, Ti 2 C/ZrO 2 interface effect mildly increased dielectric constant. Ultrahigh insulation and large aspect ratio of ZrO 2 fibers significantly reduced dielectric loss. Binary polymer/Ti 2 C and ternary polymer/Ti 2 C-ZrO 2 composites were fabricated, and better overall electric traits in ternary system were found. Ti 2 C/ZrO 2 interface effect was studied using density functional theory (DFT) calculations. Ternary composite with 12 wt% filler exhibited high dielectric constant of ~40, low dielectric loss of ~0.09 at 100 Hz and high breakdown strength of ~155 MV m −1 . This work might impulse fabrication of MXene-based hybrid fillers for dielectrics.
研究领域:
材料科学
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
DESALINATION
·
2023
·
IF 9.9
Yize Liu,Qinpeng Zhu,Xuyu Yu,Peihua Yang,Kang Liu
A comprehensive and practical model is important to the emerging electrochemical lithium extraction technology . In this study, an electrochemical model including leakage current for a LiMn 2 O 4 /Ag lithium extraction system is developed. With the consideration of leakage current, the Coulombic efficiency is below unity during charging, and the amount of lithium insertion during discharging increases, which make the model more practical and functional. The practicability of the model is validated by employing pulse and constant current profiles in charge/discharge process. It is found that the pulse current profile exhibits better electrochemical performance because of the lower overpotential, which shows higher Coulombic efficiency during charging and more lithium insertion during discharging. These simulation results fit well with experiment, demonstrating that the model with leakage current can predict the performance of different operation modes. This work may offer valuable consultation and guidance for future implementations of electrochemical lithium extraction from seawater and brine.
研究领域:
能源科学
·
电化学工程
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2024
·Vol. 21
·期 3
·1768-1777
·
IF 1.8
Liang Chen,Changxing Zhao,Peng Jiang,Shuhong Xie,Kai Pan
(1− x )Pb(Mg 1/3 Nb 2/3 )O 3 – x PbTiO 3 (PMN–PT) has attracted attention due to its excellent electrical properties as a typical relaxor ferroelectric material. High-quality Mn–Sm co-doped 0.68PMN–0.32PT thin films were synthesized on the Pt/Ti/SiO 2 /Si substrates by sol–gel based on spin coating method. The results show that 1 mol% Mn–2 mol% Sm co-doped PMN–PT thin films have high dielectric constant ( ε r ∼ 1895) and relatively low dielectric loss (tan δ ∼ .039) at 1 kHz. They also show superior ferroelectric polarization ( P max ∼ 53.71 μC/cm 2 , P r ∼ 30.85 μC/cm 2 ) and high dielectric breakdown strength (∼1656.6 kV/cm), which are primarily due to the low leakage current density (∼10 −7 A/cm 2 ). This work suggests a practical approach to enhance the dielectricity, piezoelectricity, and ferroelectricity of PMN–PT thin films.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
International Journal of Minerals Metallurgy and Materials
·
2024
·Vol. 31
·期 10
·2263-2273
·
IF 5.6
Lu Dongfei,Xi Guoqiang,Li Hangren,Tu Jie,Liu Xiuqiao,Liu Xudong,Tian Jianjun,Zhang Linxing
BiFeO 3 (BFO) has received considerable attention as a lead-free ferroelectric film due to its large theoretical remnant polarization. However, BFO suffers from a large leakage current, resulting in poor ferroelectric properties. Herein, the sol–gel method was used to deposit a series of BFO-based thin films on fluorine-doped tin oxide substrates, and the effects of the substitution of the elements Co, Cu, Mn ( B -site) and Sm, Eu, La ( A -site) on the crystal structure, ferroelectricity, and leakage current of the BFO-based thin films were investigated. Results confirmed that lattice distortion by X-ray diffraction can be attributed to the substitution of individual elements in the BFO-based films. Sm and Eu substitutions contribute to the lattice distortion in a pseudo-cubic structure, while La is biased toward pseudo-tetragonal. Piezoelectric force microscopy confirmed that reversible switching of ferroelectric domains by nearly 180° can be realized through the prepared films. The ferroelectric hysteresis loops showed that the order for the polarization contribution is as follows: Cu > Co > Mn ( B -site), Sm > La > Eu ( A -site). The current density voltage curves indicated that the order for leakage contribution is as follows: Mn < Cu < Co ( B -site), La < Eu < Sm ( A -site). Scanning electron microscopy showed that the introduction of Cu elements facilitates the formation of dense grains, and the grain size distribution statistics proved that La element promotes the reduction of grain size, leading to the increase of grain boundaries and the reduction of leakage. Finally, a Bi 0.985 Sm 0.045 La 0.03 Fe 0.96 Co 0.02 Cu 0.02 O 3 (SmLa-CoCu) thin film with a qualitative leap in the remnant polarization from 25.5 (Bi 0.985 Sm 0.075 FeO 3 ) to 98.8 µC/cm 2 (SmLa-CoCu) was prepared through the synergistic action of Sm, La, Co, and Cu elements. The leakage current is also drastically reduced from 160 to 8.4 mA/cm 2 at a field strength of 150 kV/cm. Thus, based on the increasing entropy strategy of chemical engineering, this study focuses on enhancing ferroelectricity and decreasing leakage current, providing a promising path for the advancement of ferroelectric devices.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2025
·
IF 5.1
Shuo Zhang,Hua Hao,Rui Huang,Minghe Cao,Zhonghua Yao,Hanxing Liu
Electronic power systems require the development of dielectric capacitors that combine high energy storage density and high efficiency. However, there are some unavoidable defects such as oxygen vacancies in dielectrics, which seriously deteriorate the energy storage performance. Here, a bidirectional design of defect engineering and heterogeneous interfacial construction is conducted in Fe-doped 0.8Bi0.5Na0.5TiO3–0.2Bi3.25La0.75Ti3O12 relaxor ferroelectric films to reduce leakage current and improve polarization. Simultaneously, the heterogeneous interfacial construction hinders the mass transfer process and forms more interfaces, which impede the formation of electronic pathways. The synergistic action of bidirectional design provides a substantial increase in breakdown strength, combined with excellent dielectric properties and high temperature, frequency and cycle stability. Finally, a great balance between energy storage density (83.6 J cm−3) and efficiency (74.1%) is achieved for 2 mol% Fe-doped films. This work provides a strategy for designing advanced electrostatic capacitors through defect and interface regulation.
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
Materials Today Communications
·
2024
·
IF 3.7
Jingxian He,Yongshan Ma,Zhen Jiang,Yuan Liu,Zhenfeng Jing,Shuhui Sun,Haixia Zhang,Fengqing Zhang
The aging phenomenon represents a major challenge for to the practical application of ferroelectric devices, primarily because of its detrimental impact on the material's physical and ferroelectric properties. In the present study, Bi 1-x Eu x FeO 3 (x = 0.0, 0.02, 0.04, 0.06) thin films with varying Eu doping concentrations were synthesized on ITO/glass substrates via the sol-gel method. A comprehensive investigation was conducted to analyze the impact of Eu doping on the structural, ferroelectric, ferromagnetic, leakage, and aging properties of the BFO films. X-ray diffraction (XRD) and Raman spectroscopy analyses confirmed the coexistence of R3c and Pnma phases in the film samples. X-ray photoelectron spectroscopy (XPS) analysis revealed the prevalent presence of Fe³ ⁺ and Fe²⁺ in all BEFO films, which effectively inhibited the formation of oxygen vacancies and the Fe³ ⁺ → Fe²⁺ charge transfer. Piezoresponse force microscopy (PFM) results revealed that the film with x = 0.04 exhibited the lowest surface roughness (R a ≈ 4.22 nm). Notably, at x = 0.02, the remanent magnetization (2.5 × 10⁻⁶ emu/g) was twice that of pure BFO. Additionally, at a doping concentration of 0.04, the BEFO₄ film sample exhibited significant, such as a high remanent polarization (88.82 μC/cm²) and a significantly reduced leakage current density (5.92 × 10⁻⁶ A/cm²), which corresponds to a 1.5-order-of-magnitude reduction compared to pure BFO. Furthermore, after 30 days of aging, the BEFO4 sample exhibited superior aging resistance to aging, suggesting its potential for long-term stability and reliability.
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
Keyang Shang,Yongbo Fan,Yuxin Jia,Xinghong Chen,Zhenhai Yang,Huiqing Fan,Weijia Wang
The poor electrical properties and high leakage current of BiFeO 3 -BaTiO 3 -based ceramics are the main reasons that hinder their application. A two-step sintering method prepared the 0.68Bi 1-x La x (Fe 99.8% Sb 0.2 % )O 3 -0.32BaTiO 3 ceramics (x = 0, 0.005, 0.01, 0.015, abbreviated as BL x FS-BT). The surface morphology and properties of the ceramic were observed and tested using different techniques. La ion doping significantly affects the crystal structure, leakage current, and the electro-induced strain of the BL x FS-BT ceramics. BL 0.005 FS-BT ceramics achieve 0.198 % unipolar electro-induced strain and 396 pm/V inverse piezoelectric coefficient under a 50 kV/cm electric field, and they can maintain good temperature stability at high temperatures. A large strain of 0.43 % was obtained at 150 °C. The inhibition effect of La ion on Fe valence and oxygen vacancy formation also greatly improves the insulation performance of ceramics. This work shows that BF-BT-based ceramics via ion substitution defect engineering effectively enhance electrical and insulating properties.
研究领域:
材料科学
·
电物理学
✓ 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）