研究目的
Investigating the enhanced temperature stability and defect mechanism of BNT-based lead-free piezoceramics through a quenching process.
研究成果
The quenching process significantly enhances the depolarization temperature and thermal stability of BNTBT6 lead-free piezoelectric ceramics, attributed to oxygen vacancies pinning the domain walls. This study provides insights into improving the temperature stability of BNT-based ceramics and potentially other ferroelectrics.
研究不足
The study is limited to BNTBT6 ceramics and the specific effects of quenching and annealing processes. The generalizability to other materials or conditions is not explored.
1：Experimental Design and Method Selection:
The study focuses on enhancing the temperature stability of BNTBT6 piezoceramics through a quenching process. X-ray photoelectron spectroscopy (XPS) and electron paramagnetic resonance (EPR) methods are employed to investigate the defect mechanism.
2：Sample Selection and Data Sources:
BNTBT6 ceramics are prepared using traditional solid-state reaction sintering process. Samples are subjected to normal sintering (NS) and quenching (QS) processes.
3：List of Experimental Equipment and Materials:
High-energy X-ray diffraction, ferroelectric instrument (aixACCT TF Analysar 1000, Germany), scanning electron microscope (SEM, JEOL, Tokyo, Japan), and piezoresponse force microscope (PFM, MFP-3D, Asylum Research, USA) are used.
4：Experimental Procedures and Operational Workflow:
The ceramics are sintered at 1100 °C for 1 h, followed by either slow cooling (NS) or fast cooling in air (QS). Some QS samples undergo postannealing at different temperatures and durations.
5：Data Analysis Methods:
Temperature-dependent dielectric, piezoelectric, and ferroelectric behaviors are measured to evaluate the enhanced temperature stability.
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