A5076862815- Ferroelectric and Piezoelectric Materials
- Microwave Dielectric Ceramics Synthesis
- Dielectric materials and actuators
- Multiferroics and related materials
- Acoustic Wave Resonator Technologies
- Advanced ceramic materials synthesis
- Dielectric properties of ceramics
- Layered Double Hydroxides Synthesis and Applications
- Advanced Sensor and Energy Harvesting Materials
- Electromagnetic wave absorption materials
- Thermal properties of materials
- Bone Tissue Engineering Materials
- Innovative Energy Harvesting Technologies
- Seismic Waves and Analysis
- Innovations in Concrete and Construction Materials
- Luminescence Properties of Advanced Materials
- Advanced Antenna and Metasurface Technologies
- Antenna Design and Analysis
- Additive Manufacturing and 3D Printing Technologies
- Perovskite Materials and Applications
- Structural Health Monitoring Techniques
- Vibration Control and Rheological Fluids
- Piezoelectric Actuators and Control
- Engineering Applied Research
- Magneto-Optical Properties and Applications
Huazhong University of Science and Technology
2015-2024
Institute of Advanced Manufacturing Technology
2022-2024
Wuhan National Laboratory for Optoelectronics
2018-2023
Wenzhou University
2023
Qiqihar Medical University
2022
Ministry of Education of the People's Republic of China
2015-2020
A high dielectric energy storage performance is achieved in a 0.85Bi<sub>0.5</sub>Na<sub>0.5</sub>TiO<sub>3</sub>–0.15NaNbO<sub>3</sub> lead-free ferroelectric ceramic <italic>via</italic> composition and microstructure engineering.
Lead-free piezoelectric ceramics (1 − x)(Na1/2Bi1/2)TiO3–xKNbO3 (abbreviated as NBT–KN100x, x = 0–0.12) were synthesized by the conventional ceramic sintering technique. The phase transition behaviour in NBT–KN100x with respect to changes composition and temperature was investigated using x-ray diffraction analysis, dielectric ferroelectric characterizations. At 0.04–0.06, rhombohedral pseudo-cubic morphotropic boundary (MPB) occurs ceramics. Near MPB, NBT–KN5 exhibit optimum properties: kp...
Abstract Ba 1+1/ M [Si 2 O 5+1/ ] low‐permittivity microwave dielectric ceramics are prepared using the conventional solid‐state method. Pure phases obtained in barium silicates with = 1, 3, 4, 5, and ∞, except for 7, which two phases, 5 Si 8 21 BaSi , observed. As complexity of crystal structure described by Shannon information per reduced unit cell increases, τ f value tends to change from a negative positive value, has highest complexity. A single phase ε r anomaly peak at −180°C exhibits...
The piezoelectric strain coefficient d33* always deteriorates rapidly with increasing temperature, which is one of the technical bottlenecks restricting practical applications ceramics at high temperatures. Herein, we successfully prepared (1 – x)(0.7BFeO3-0.3Ba(Hf0.05Ti0.95)O3)-x(Bi0.2Sr0.7)TiO3 by conventional solid-state method, possessed a = 490 pm/V 245 °C. In particular, insensitive to temperature range 25 Microstructure characterization and electrical performance measurements showed...
The crystal structure and piezoelectric properties of ternary ceramics x(Bi1∕2Na1∕2)TiO3–y(Bi1∕2K1∕2)TiO3–zKNbO3 (abbreviated as BNT-BKT-KN100x∕100y∕100z) system have been investigated. Effects BKT KN on the crystalline were examined. morphotropic phase boundary (MPB) diagram BNT-BKT-KN was determined by x-ray diffraction patterns from sintered specimens. Near MPB, BNT-BKT-KN82∕16∕2 had good performances with constant d33=215pC∕N which reached a maximum value in this planar electromechanical...
As an alternative to conventional vapor-compression refrigeration, cooling devices based on electrocaloric (EC) materials are environmentally friendly and highly efficient, which promising in realizing solid-state cooling. Lead-free ferroelectric ceramics with competitive EC performance urgently desirable for devices. In the past few decades, constructing phase coexistence high polarizability have been two crucial factors optimizing performance. Different from external stress generated...
This paper reports composites prepared by embedding core-shell Ag@TiO2 fillers into polytetrafluoroethylene. Ag nanoparticles were homogeneously coated with TiO2, to give a shell thickness of approximately ∼8–10 nm. The composite containing rutile shells exhibited better dielectric properties than the anatase shells. relative permittivity (εr) 70 vol. % filler was 240 at 100 Hz, which more times higher that pure polytetrafluoroethylene (εr = 2.1). An effective medium percolation theory model...
Abstract Low‐permittivity ZnAl 2‐ x (Zn 0.5 Ti ) O 4 ceramics were synthesized via conventional solid‐state reaction method. A pure 2 solution with an Fd‐3m space group was achieved at ≤ 0.1. Results showed that partial substitution of [Zn ] 3+ for Al effectively lowered the sintering temperature and remarkably increased quality factor ( Q × f values. Optimum microwave dielectric properties ε r = 9.1, 115,800 GHz τ −78 ppm/°C) obtained in sample 0.1 sintered 1400°C oxygen atmosphere 10 h....
A flat Luneburg lens antenna for Ku-band (12-18 GHz) applications is proposed and designed using ceramic 3-D printing. Metamaterial structures transformation optics technology are used to realize the gradient dielectric constant, compress height, reduce weight of lens. The printed lens, combined with a 10 dB standard gain horn antenna, obtained an up 19.1 dBi over operating frequency thickness reduction 78%. In addition, ability perform passive beam scanning limited power loss achieved. This...