Article
Materials Science, Ceramics
Yuanyuan Wang, Hongbo Liu, Tingnan Yan, Jianwei Zhao, Shifeng Guo, Rong Sun, Zhilun Lu, Dawei Wang
Summary: In this study, Nb-doped 0.75SrTiO(3)-0.25BiFeO(3) (ST-BF) lead-free ceramics were designed and synthesized, and the effects of Nb doping on microstructure, dielectric, and electrical properties were investigated. It was found that Nb doping led to changes in crystal structure, grain size, and improved dielectric properties, with the 0.03 Nb-doped ST-BF composition exhibiting low dielectric loss and stable dielectric constant. Impedance spectroscopy analysis showed that Nb doping increased the total resistivity, forming an electrically conductive core and a nonconductive shell with enhanced activation energy.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Tsz-Lung Ho, Keda Ding, Nikolay Lyapunov, Chun-Hung Suen, Lok-Wing Wong, Jiong Zhao, Ming Yang, Xiaoyuan Zhou, Ji-Yan Dai
Summary: This study reports on the multilevel resistive switching characteristics in SnSe/STO heterojunction-based memory devices, demonstrating reliable and stable bipolar resistive switching. By using different electrode conditions, multilevel state switching ability is achieved, providing a potential solution for the application of synaptic devices in neuromorphic computing.
Article
Nanoscience & Nanotechnology
Lili Ding, Ye Ji, Xiaoyue Zhang, Mengjun Wu, Yue Zheng, Biao Wang, Weijin Chen
Summary: A new type of topological nanoisland domain texture has been discovered, with unique transport characteristics and rectifying behavior. These nanoislands exhibit exotic quad-domain textures, which show a higher conductance in the quad-domains compared to the cross-shaped buffer domains, indicating a correlation between local conductance and domain textures. This research sheds light on the potential applications of these domain textures in configurable electronic devices.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Neurosciences
Thomas F. Tiotto, Anouk S. Goossens, Jelmer P. Borst, Tamalika Banerjee, Niels A. Taatgen
Summary: Researchers conducted measurements on interface-type memristors to validate their use in neuromorphic hardware, specifically utilizing Nb-doped SrTiO3 memristors as synapses in a simulated neural network. Through a novel supervised learning algorithm and noise injection to simulate real-world conditions, the memristors showed potential as synaptic weight elements, suggesting their suitability for future computing platforms.
FRONTIERS IN NEUROSCIENCE
(2021)
Article
Chemistry, Physical
Haoyang Sun, Zhen Luo, Chuanchuan Liu, Chao Ma, Zijian Wang, Yuewei Yin, Xiaoguang Li
Summary: This study reports a flexible FTJ memristor grown on a mica substrate, which exhibits stable voltage-tuned multistates and robust resistive switching behavior after multiple bending cycles. Artificial neural network simulations based on experimental device behaviors demonstrate high recognition accuracies, highlighting the potential applications of this flexible FTJ as a data storage and processing device.
JOURNAL OF MATERIOMICS
(2022)
Article
Physics, Applied
Lulu Wang, Jiameng Sun, Yinxing Zhang, Jiangzhen Niu, Zhen Zhao, Zhenqiang Guo, Zixuan Zhang, Yiduo Shao, Shiqing Sun, Xiaotong Jia, Xu Han, Xiaobing Yan
Summary: This study presents the fabrication of Li0.09Bi0.91FeO3 as the functional layer for a ferroelectric memristor device, enabling information processing and programmable characteristics.
APPLIED PHYSICS LETTERS
(2022)
Article
Chemistry, Physical
Chenghao Zhu, Wenbo Ye, Peng Zheng, Hongfei Zhang, Fuan Lu, Qiaolan Fan, Jingji Zhang, Liang Zheng, Yang Zhang, Wangfeng Bai
Summary: By introducing SBT additive, a high-performance BF-ST-xSBT ceramic system was successfully designed and prepared, showing excellent energy storage performance, good stability, and fatigue endurance, making it a promising candidate for energy storage applications.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Materials Science, Ceramics
Tao Cui, Annan Yu, Yangyu Zhang, Jian Guo, Xiongjie Li, Shun Guo, Ji Zhang, Jing Wang, Shan-Tao Zhang
Summary: Dielectric capacitors, particularly lead-free ceramics, have great potential in high power and pulsed power electronic devices. However, the relatively small recoverable energy storage density is a challenge. This study successfully improved the relaxor behavior and breakdown strength of a specific ceramic composition, resulting in superior comprehensive energy storage performance and reliability, making it a prospective alternative for electrostatic energy storage.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Ceramics
Yoon Hyung Keum, Jong Yeog Son
Summary: We investigated the ferroelectric switching dynamics, as well as the multiferroic and piezoelectric properties of highly a-oriented epitaxial Bi5Ti3FeO15 (BTFO) thin films on Nb-doped SrTiO3 single crystal substrates. The highly a-oriented epitaxial BTFO thin films exhibited the best ferroelectric properties, while the highly c-oriented epitaxial BTFO thin films exhibited the best ferromagnetic properties. Particularly, the BTFO thin films with a proper mix of a- and c-oriented crystallinity showed the best piezoelectric properties.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
Zhi-Hao Shen, Wen-Hua Li, Xin-Gui Tang, Hao Chen, Jia Hu, Kai-Yuan Wang, Ke Meng, Yan-Ping Jiang, Xiao-Bin Guo
Summary: To overcome the limitations of the von Neumann architecture, scholars have proposed neuromorphic computing using artificial synapses and neural network algorithms. In this study, an artificial synapse based on Al-doped SrTiO3 (STAO) thin film was fabricated using a low-cost sol-gel method. The STAO device effectively emulated various synaptic functions and showed improved stability, linearity, and image recognition accuracy compared to SrTiO3 (STO) devices. The increase in oxygen vacancy content due to Al doping was identified as the main factor contributing to the improved performance.
Article
Chemistry, Physical
Zhen Zhao, Amr Abdelsamie, Rui Guo, Shu Shi, Jianhui Zhao, Weinan Lin, Kaixuan Sun, Jingjuan Wang, Junling Wang, Xiaobing Yan, Jingsheng Chen
Summary: The study presents a flexible artificial synapse based on ferroelectric tunnel junctions, which demonstrates excellent ferroelectric properties and stable synaptic learning performance. This flexible artificial synapse shows promising opportunities for widespread application in future neuromorphic computing systems.
Article
Chemistry, Multidisciplinary
Hongbo Liu, Ying Sun
Summary: This study investigates the defects in BiFeO3 and BiFeO3-based ceramics and discusses the conduction mechanism. The results show that doping with Mn and Nb can affect the conductivity.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2022)
Article
Chemistry, Multidisciplinary
Zhenhai Li, Tianyu Wang, Jialin Meng, Hao Zhu, Qingqing Sun, David Wei Zhang, Lin Chen
Summary: In this study, aluminum-doped HfO2 (HfAlO) ferroelectric thin films were deposited on a muscovite substrate, and the effect of bending on the ferroelectric characteristics of the Au/Ti/HfAlO/Pt/Ti/Mica device was investigated. After 1000 bending times, the ferroelectric properties and fatigue characteristics were significantly degraded. Finite element analysis revealed that crack formation was the main reason for fatigue damage under threshold bending diameters. Furthermore, the HfAlO-based ferroelectric synaptic device exhibited excellent performance in neuromorphic computing, with the ability to mimic paired-pulse facilitation and long-term potentiation/depression of biological synapses. Meanwhile, the accuracy of digit recognition was 88.8%. This research offers new insights for further development of hafnium-based ferroelectric devices.
MATERIALS HORIZONS
(2023)
Article
Nanoscience & Nanotechnology
R. F. Niu, D. P. Wang, L. Q. Cui, W. T. Wang
Summary: All-perovskite oxide heterostructure of SrSnO3/Nb-doped SrTiO3 was fabricated and investigated for its unusual transport properties. Diodelike rectifying behavior was observed in the forward current while the temperature-dependent IV curves showed tunneling effects in the reverse bias. The electrical transport mechanism was explained using the thermionic emission model and the Poole-Frenkel emission.
Article
Nanoscience & Nanotechnology
Hangfei Li, Sunyingyue Geng, Tong Liu, MingHui Cao, Jie Su
Summary: In this study, a CeO2/Nb-SrTiO3 heterojunction memristor with gradually tunable conductance was reported. Its switching behavior and high switching ratio enabled it to mimic various biological synaptic functions. Additionally, a convolutional neural network based on the memristors achieved high recognition accuracy in diagnosing diseases from electrocardiogram data and recognizing handwritten digits. These findings expand the research scope of high-level synaptic behavior and lay the foundation for future full synaptic memristor networks.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Materials Science, Ceramics
Lei Liu, Zijian Zhou, Xiangkun Elvis Cao, Yue Zhou, Dejun Peng, Ying Liu, Xiaowei Liu, Minghou Xu
Summary: Many dopants have been explored to improve the heat storage performance and sintering resistance of Co3O4, but the performance of these materials is not comparable due to different synthesis methods and test conditions. This study systematically compared and screened nine dopants, including four unreported ones, under the same conditions. The results showed that Cu and Zr doping had the highest re-oxidation rate, while Si and Mg doping had adverse effects on the conversion rate. Cu-doped sample exhibited higher re-oxidation rate and energy density, while Zr-doped sample exhibited more stable cyclability.
CERAMICS INTERNATIONAL
(2023)
Article
Automation & Control Systems
Lei Liu, Yongxiong Liu, Lilin Zhou, Bo Wang, Zhongtao Cheng, Huijin Fan
Summary: In this paper, the application of active disturbance rejection control (ADRC) based on a neural network for the attitude control of a hypersonic vehicle (HV) with uncertain disturbances is investigated. The strong coupling of the HV poses challenges for separate ADRC design for each channel. A cascade active-rejection control scheme is proposed to mitigate this issue, using a Radial Basis Function (RBF) Neural Network instead of the Extended State Observer (ESO) in ADRC. The proposed NNESO-based cascade ADRC demonstrates effective disturbance resistance for HV control.
JOURNAL OF THE FRANKLIN INSTITUTE-ENGINEERING AND APPLIED MATHEMATICS
(2023)
Article
Chemistry, Physical
Wei Li, Yunpeng Ma, Tianyi Feng, Ziwan Du, Yixuan Liu, Sergei Kalinin, Jing-Feng Li, Qian Li
Summary: Understanding symmetry breaking in ferroelectric materials is crucial for manipulating their functional properties. We developed a spectral imaging method using optical second harmonic generation to investigate the mechanisms behind crystallographic symmetry breaking. By studying (K,Na)NbO3 single crystals, we demonstrated the method's ability to analyze domain variants and their thermal evolution across phase transitions. The method can be extended to other ferroelectric materials with potential enhancements.
JOURNAL OF MATERIOMICS
(2023)
Article
Chemistry, Physical
Kejun Bu, Tonghuan Fu, Ziwan Du, Xin Feng, Dong Wang, Zhongyang Li, Songhao Guo, Zongdong Sun, Hui Luo, Gang Liu, Yang Ding, Tianyou Zhai, Qian Li, Xujie Lu
Summary: This study demonstrates the significant role of cationic configuration in nonlinear optical (NLO) properties, achieving a remarkable enhancement in second-harmonic generation (SHG) by continuously tuning the Cu displacement under pressure. The in situ high-pressure structural characterization shows that Cu cations move from the van der Waals edge to the cages of S6 octahedra and form highly distorted [CuS6] octahedra. The contributions of cationic displacement on octahedral distortion and interband dipole moments are quantitatively demonstrated, which dominate optical nonlinearity and determine the enhanced SHG.
CHEMISTRY OF MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Yongjun Du, Yiwei Xu, Jingen Wu, Jiacheng Qiao, Zhiguang Wang, Zhongqiang Hu, Zhuangde Jiang, Ming Liu
Summary: This study presents the first VLF underwater communication system based on a pair of acoustically actuated magnetoelectric antennas. The feasibility of the ME antennas for portable underwater communication is confirmed through theoretical analysis, finite element simulation, and experimental verification.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Multidisciplinary Sciences
Haozhi Sha, Yunpeng Ma, Guoping Cao, Jizhe Cui, Wenfeng Yang, Qian Li, Rong Yu
Summary: Defects in crystals have a significant role in influencing the mechanical, electrical, luminescent, and magnetic behaviors of materials. However, accurately measuring defect structures has been challenging due to symmetry breaking and complex modifications in atomic configuration and crystal tilt at the defects. In this study, deep-sub-angstrom resolution imaging of dislocation cores was achieved using multislice electron ptychography with an adaptive propagator, allowing for sub-nanometer scale mapping of crystal tilt and depth-dependent atomic structure recovery of dislocations. This deep-sub-angstrom resolution and depth-dependent imaging of defects holds great potential for revealing microstructures and properties of real materials and devices.
NATURE COMMUNICATIONS
(2023)
Article
Automation & Control Systems
Huijin Fan, Xinpeng Fang, Wei Wang, Jiangshuai Huang, Lei Liu
Summary: This paper studies the fault-tolerant control problem for a class of nonlinear systems with uncertain parameters and unknown actuator failures. An adaptive fault-tolerant control scheme based on event-triggered strategy is proposed, and a set of event-triggering conditions are designed for both the controller and the parameter estimators. It has been proven that the closed-loop signals are globally uniformly bounded and the system output converges to a compact set. A modified fault-tolerant control scheme is also designed for the case with a finite number of failures, ensuring the asymptotic convergence of system states. The effectiveness of the proposed schemes is illustrated through a robot manipulator example.
Article
Physics, Applied
Guohua Wu, Zhong Yu, Rongdi Guo, Zhiguang Wang, Hong Wang, Zhongqiang Hu, Ming Liu
Summary: To achieve compact and lightweight power conversion devices, MnZn ferrite doped with high-valent Sn4+ ions is used to manipulate electromagnetic properties and suppress high-frequency core losses. The Sn4+ ions mainly occupy grain boundaries rather than dissolving into the lattice, significantly impacting the electromagnetic properties. With increasing Sn substitution, initial permeability and saturation induction decrease monotonically. A Sn substitution content of 0.003 reduces core losses to 457 kW m(-3) at 3 MHz, 30 mT, and 25 degrees C, effectively suppressing eddy current loss and residual loss. The sample with Sn content of 0.003 demonstrates excellent overall electromagnetic properties, making it potentially useful in high-frequency transformers, converters, and power sources.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Engineering, Aerospace
Gaoxiang Peng, Bo Wang, Lei Liu, Huijin Fan, Zhongtao Cheng
Summary: In this article, a real-time entry trajectory generation algorithm with modular policy is proposed to achieve adaptability to various missions. Deep reinforcement learning is utilized to train two modules, providing a reliable trajectory and solving state misalignment and contradiction.
AEROSPACE SCIENCE AND TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Jingen Wu, Yongjun Du, Yiwei Xu, Jiacheng Qiao, Yuhan Qu, Zhiguang Wang, Shuxiang Dong, Zhongqiang Hu, Ming Liu
Summary: A face-shear type magnetoelectric (ME) sensor is demonstrated using a composite material of (PbMg0.33Nb0.67O3)(1-x)-(PbTiO3)(x) piezoelectric single crystal (PMN-PT) and Metglas amorphous alloy. The sensor is capable of detecting weak magnetic fields by inducing face-shear strain in PMN-PT through the magnetostriction of Metglas, resulting in the generation of an ME voltage.
IEEE SENSORS JOURNAL
(2023)
Article
Physics, Condensed Matter
Krishna K. Ghose, Yun Liu, Terry J. Frankcombe
Summary: The structural and vibrational properties of rutile and anatase TiO2 were investigated using density functional theory. Different exchange-correlational energy functionals were employed, and their effects on the calculated properties were analyzed. The results showed that the choice of functional had a significant impact on the phonon dispersion relations, but had little effect on the thermodynamic properties.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2023)
Article
Materials Science, Ceramics
Guohua Wu, Zhong Yu, Rongdi Guo, Zhiguang Wang, Hong Wang, Zhongqiang Hu, Ming Liu
Summary: This study investigates the relationship between domain morphology, dynamic magnetization behavior, and high-frequency core losses in MnZn ferrites by producing MnZn ferrites with different grain sizes through changing the sintering temperature. The results show that when the grain size approaches the critical size, the residual loss is effectively reduced, while an increase in grain size leads to a sharp increase in residual loss.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Engineering, Aerospace
Z. Y. Yin, B. Wang, R. T. Xiong, Z. Xiang, L. Liu, H. J. Fan, C. L. Xue
Summary: This paper investigates the constrained attitude control problem of hypersonic vehicles and proposes an improved prescribed performance dynamic surface control method. An adaptive scaling strategy is introduced to avoid state violation, and a nonlinear disturbance observer is used to compensate system disturbances. Numerical simulations demonstrate the effectiveness and superiority of the proposed method.
AERONAUTICAL JOURNAL
(2023)
Article
Engineering, Electrical & Electronic
Jiaming Liu, Mengmeng Guan, Yiwei Xu, Shuang Zhao, Wei Su, Cuiling Zhang, Zhiguang Wang, Xiaohui Zhang, Zhongqiang Hu, Zhuangde Jiang, Ming Liu
Summary: In this work, a new weak-current sensor module based on the tunneling magnetoresistive (TMR) effect was developed, which can accurately measure microamperes-level weak electric currents. The sensor has low noise, high sensitivity, and wide bandwidth, and performs well in both DC and AC current measurements. This sensor has significant potential for applications in industrial fields such as smart grids and green energy.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2023)
Article
Chemistry, Physical
Jingen Wu, Zhongqiang Hu, Chaoyu Wu, Ming Ma, Xin He, Jiacheng Qiao, Zhiguang Wang, Shuxiang Dong, Ming Liu
Summary: This study proposes a method for observing thermal depolarization by examining the strain induced by 90-degree domain switching, and verifies the effectiveness of the method using tetragonal BiScO3-PbTiO3 (BS-PT) piezoelectric ceramic samples.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
