研究目的
Investigating the improvement of dielectric breakdown strength and energy storage performance in Er2O3–modified 0.95Sr0.7Ba0.3Nb2O6-0.05CaTiO3 lead-free ceramics.
研究成果
The addition of Er2O3 effectively improves the microstructure, dielectric breakdown strength, and energy storage efficiency of SBNCTEx ceramics. The SBNCTE5 ceramics achieved an average BDS value of up to 34.4 kV/mm and an energy storage efficiency of 91.4%, indicating good prospects for energy storage applications.
研究不足
The study focuses on the effects of Er2O3 doping on the microstructures, interface polarization, and energy storage properties of SBNCT ceramics. Potential areas for optimization include further understanding the conduction mechanisms and exploring other dopants or composite materials for enhanced performance.
1：Experimental Design and Method Selection:
Traditional solid-state method was used to synthesize SBNCTEx ceramics. The microstructure, energy storage properties, and the relationship between dielectric breakdown strength and interfacial polarization were investigated.
2：Sample Selection and Data Sources:
Raw powders with at least 99% purity were used to prepare SBN and CT powders, which were then mixed with Er2O3 powders based on the designed chemical composition.
3：List of Experimental Equipment and Materials:
X-ray diffraction (PANalytical PW3040/60), field emission scanning electron microscope (TESCAN MAIA3), frequency response analyzer (Agilent 4294A), withstand voltage tester (Meiruike, RK2671A), and a ferroelectric test system (HVI0203-234, Radiant Technology).
4：Experimental Procedures and Operational Workflow:
Powders were mixed, calcined, pressed into pellets, sintered, and then characterized for their phase structures, surface morphologies, impedance spectroscopy, DC dielectric BDS, and P-E hysteresis loops.
5：Data Analysis Methods:
Weibull distribution for BDS analysis, Arrhenius law for bulk conductivity and temperature relationship, and equivalent R-CPE parallel circuit for fitting impedance experimental data.
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