Publications by authors named "Chukai Chen"
Article Synopsis
- PbYb Nb O (PYN)-based ceramics are promising for high energy storage due to their low sintering temperature and ultra-high phase-switching field, but they struggle with insufficient breakdown strength which limits their performance.
- This study employs a strategy of Ba substitution and microstructure optimization through hot-pressing to enhance the energy storage capabilities, achieving significant energy densities and high current and power densities with 2 mol% Ba doping.
- In situ characterization reveals the movement of B-site ions under an electric field is crucial for maximizing the phase-switching field, while finer grain structure from microengineering improves breakdown strength, highlighting PYN ceramics' potential in energy storage applications.
High Piezoelectricity in Eco-Friendly NaNbO-Based Ferroelectric Relaxor Ceramics via Phase and Domain Engineering.
ACS Appl Mater Interfaces
February 2023
To meet the requirements of environmental friendliness, high-performance lead-free piezoelectric materials have become important materials for next-generation electronic devices. Here, lead-free and potassium-free NaNbO (NN)-based ceramics with high piezoelectric ( = 361 ± 10 pC/N) and dielectric (ε = 4500) properties were obtained by tolerant preparation techniques. The excellent piezoelectric and dielectric properties can be attributed to the relaxor morphotropic phase boundaries (R-MPB) and coexisting domain regions, which are beneficial in lowering the free energy and greatly improving the dielectric response and domain switching capability.
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- Lead-free ceramics are gaining popularity in pulsed power systems due to their high power density and eco-friendliness, but they face challenges with low energy storage density.
- To address this issue, researchers designed gradient-structured ceramics using a tape-casting method, achieving improvements in energy storage density and efficiency.
- These optimizations resulted in recoverable energy storage densities exceeding 6.5 J/cm³ and efficiencies around 90%, while maintaining stability across various conditions.
An incommensurate modulated antiferroelectric phase is a key part of ideal candidate materials for the next generation of dielectric ceramics with excellent energy storage properties. However, there is less research carried out when considering its relatively low polarization response. Here, the incommensurate phase is modulated by stabilizing the antiferroelectric phase and the energy storage performance of the incommensurate phase under ultrahigh electric field is studied.
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