A5101784523- Ferroelectric and Piezoelectric Materials
- Acoustic Wave Resonator Technologies
- Multiferroics and related materials
- Magnetic confinement fusion research
- Ionosphere and magnetosphere dynamics
- Advanced Sensor and Energy Harvesting Materials
- Advanced Sensor Technologies Research
- Dielectric properties of ceramics
- Dielectric materials and actuators
- Ultrasonics and Acoustic Wave Propagation
- Microwave Dielectric Ceramics Synthesis
- Metal and Thin Film Mechanics
- Cryospheric studies and observations
- Conducting polymers and applications
- Electronic and Structural Properties of Oxides
- Advanced MEMS and NEMS Technologies
- Landslides and related hazards
- Solar Thermal and Photovoltaic Systems
- Perovskite Materials and Applications
- Flow Measurement and Analysis
- Tropical and Extratropical Cyclones Research
- Engineering Applied Research
- Underwater Acoustics Research
- Luminescence and Fluorescent Materials
- Metallurgical Processes and Thermodynamics
Institute of Plasma Physics
2024
Chinese Academy of Sciences
2024
Tsinghua University
2008-2021
State Key Laboratory of New Ceramics and Fine Processing
2013-2021
China Railway Eryuan Engineering Group Co.
2021
China Railway Group (China)
2021
Southwest Jiaotong University
2019
Jiangsu University of Science and Technology
2018
Tohoku University
2016-2017
Harbin University of Science and Technology
2014
Introducing local structural heterogeneity can be a feasible way to achieve high and thermally stable piezoelectric response in lead-free piezoelectrics.
Abstract Lead zirconate titanate (PZT)‐based piezoelectric ceramics are important functional materials for various electromechanical applications, including sensors, actuators, and transducers. High coefficient mechanical quality factor essential the resonant application. However, since these properties often inversely proportional, simultaneously high performances hard to achieve, consequently, a wide range of applications strongly restricted. In present study, exceptionally well‐balanced...
Due to growing concern for the environment and human health, searching high-performance lead-free piezoceramics has been a hot topic of scientific industrial research. Despite significant progress achieved toward enhancing piezoelectricity, further efforts should be devoted synergistic improvement piezoelectricity its thermal stability. This study provides new insight into these topics. A KNN-based ceramic material is presented, which features large piezoelectric coefficient (d33) exceeding...
The leakage current of BiFeO3 thin films can be reduced by Sm or Ti doping, and their codoping effect is significant. X-ray photoelectron spectroscopy revealed that the reduction in ascribed to decreased Fe2+ ions oxygen vacancies. mechanisms pristine doped were studied analyzing characteristics through curve fitting. It was found could stabilize trapped carriers, while might decrease trap energy contrarily benefit excitation which explains greater reducing than Sm. piezoelectric properties...
The morphology control of β-indium sulfide (β-In2S3) microspheres has been achieved through a one-step solvothermal route, by simply adjusting the combinations two additives, n-butanol and Span80. products show complex hierarchical structures assembled from nanoscaled building blocks. evolution can be realized on both outside (surface) inside (hollow cavity) microsphere. Electrochemical measurements have shown that these In2S3 possess higher initial Li intercalation capacity than graphitic...
To attain a deep understanding of ferroelectric and piezoelectric characteristics K0.5Na0.5NbO3 as promising lead-free compound, the responses its epitaxially grown films with three primary orientations [001], [110], [111] were investigated an emphasis on influence crystallographic orientation. The prepared by sol-gel processing using Nb-doped SrTiO3 single-crystalline substrates various cutting directions. A peak remnant polarization value (Pr) 17.3 μC/cm2 was obtained along [110] direction...
A new paradigm for the simultaneous enhancement of piezoelectric response and temperature stability by a compositionally modulated diffused phase transition.
Recent research progress in (K,Na)NbO3 (KNN)-based lead-free piezoelectric ceramics has attracted increasing attention for their applications to microsystems or microelectromechanical systems (MEMS) the form of thin films. This work demonstrates that high-quality KNN-based epitaxial films can be synthesized by a conventional sol-gel method, whose phase structure and domain characteristics have been investigated with emphasis on temperature effect. A monoclinic MC is observed at room films,...
Functional polymers such as polyvinylidene fluoride (PVDF) and its copolymers, which exhibit room-temperature piezoelectricity ferroelectricity in two-dimensional (2D) limit, are promising candidates to substitute hazardous lead-based piezoceramics for flexible nanoelectronic electromechanical energy-harvesting applications. However, realization of many including PVDF ultrathin 2D nanostructures with desired crystal phases tunable properties remains challenging due ineffective conventional...
Abstract Extensive research and great progress of (K,Na)NbO 3 (KNN)‐based lead‐free piezoelectric films have been driven by the current legislation requirement for sustainable development society environment in applications microelectromechanical systems. A comprehensive discussion recent achievement KNN‐based is presented herein. First, available synthetic techniques, chemical modification, ferroelectric properties are reviewed, followed an introduction crystal structures electrical...
Abstract With the development of advanced electrical and electronic devices requirement environmental protection, lead‐free dielectric capacitors with excellent energy storage performance have aroused great attention. However, it is a challenge to achieve both large density high efficiency simultaneously in capacitors. This work investigates sol‐gel‐processed (K,Na)NbO 3 ‐based ferroelectric films on silicon substrates compositions 0.95(K 0.49 Na Li 0.02 )(Nb 0.8 Ta 0.2 )O ‐0.05CaZrO ‐ x...
Abstract The decrease in tungsten (W) content with the higher ion cyclotron resonance heating (ICRH) power is observed and explained for first time a high injection (Pinj>10MW), performance (βN~2, βP~2.8, ne/nGW~80%, fBS~60%) H-mode discharge on experimental advanced superconducting tokamak (EAST). Unlike previous phenomenon of electron (ECRH) core W control (Shengyu Shi et al 2022 Nucl. Fusion 62 066031), there slight change background plasma temperature when ICRH applied, but toroidal...
Abstract Fishbone modes and Alfvén eigenmodes (AEs) are two of the most significant core magnetohydrodynamic (MHD) events observed in advanced scenarios on Experimental Advanced Superconducting Tokamak (EAST). Microwave reflectometry, with its excellent spatial temporal resolution, has been utilized to study their behaviors. During fishbone event, density profile gradient 〖(∇n〗_e), measured by reflectometry (DPR), vicinity mode modulated rotation internal kink modes. Furthermore, position...
Abstract Microwave reflectometry will serve as the primary diagnostic tool for measuring plasma density in ITER. The real-time inversion of high spatiotemporal resolution profiles is a critical research focus fueling and control both current future fusion devices. A fast profile algorithm based on deep neural network model has been proposed microwave database under various discharge parameters EAST. Firstly, directly takes high-sampling-rate raw time-domain I/Q data from mutli-bands (Q-, V-...
Lead‐free ( K , Na ) NbO 3 KNN piezoelectric films were fabricated on Nb : SrTiO substrates by sol–gel process, and the influence of thermal processing details microstructure ferroelectric property was investigated. Experimental results confirmed different appearance polycrystalline growth epitaxial modes during crystallization thin films. These two occurred under conditions within narrow pyrolysis temperature scope ranging from 400°C to 500°C, respectively. By considering these findings, an...
Abstract Monoclinic phases, as intermediate phases at the morphotropic phase boundary, have been considered origin of high piezoelectricity in various piezoelectric systems. However, those monoclinic seldom experimentally observed boundary lead‐free (K,Na)NbO 3 (KNN)‐based materials. This work shows that KNN epitaxial thin films demonstrate a M C stabilized by elastic strain room temperature, which is identified both synchrotron X‐ray reciprocal space mapping and piezoresponse force...
Using piezoresponse force microscopy (PFM) and Raman spectroscopy, we studied the local temperature-dependent piezoelectric properties phase structures of 0.95(Bi0.5Na0.5)TiO3-0.05BaTiO3 (BNT-BT) single crystals. Local-area PFM revealed non-ergodic relaxor behavior around 160 °C. Switching spectroscopy-PFM (SS-PFM) results also supported transition °C, with a gradual decrease in hysteresis width nucleation bias. Moreover, spectroscopy provided structural evidence same temperature region....