研究目的
Investigating the effects of LiCuTa3O9 doping on the piezoelectric and ferroelectric properties of K0.5Na0.5NbO3 lead-free piezoceramics, focusing on the relationship between microscopic defect structures and electrical properties.
研究成果
The study demonstrates that LCT doping significantly affects the piezoelectric and ferroelectric properties of KNN-based ceramics through the generation and reduction of defect complexes. Optimal doping levels (x ≤ 0.015) result in hardened electrical behaviors with high Qm, while excess doping leads to softening. The ceramics maintain good piezoelectric performances even at higher doping levels, indicating the potential for lead-free piezoelectric applications.
研究不足
The study is limited to the effects of LCT doping on KNN-based ceramics. The relationship between defect structures and electrical properties is complex and may require further investigation to fully understand the mechanisms involved.
1：Experimental Design and Method Selection:
Conventional sintering technique was used to synthesize KNN-xLCT piezoceramics. The phase structures were detected by XRD, and microtopographies were observed by SEM. Dielectric, ferroelectric, and piezoelectric properties were measured.
2：Sample Selection and Data Sources:
Samples were prepared with varying mol% of LCT (x = 0 to
3：03). Raw materials included carbonates and metal oxides. List of Experimental Equipment and Materials:
XRD spectrometer (Smart Lab, Rigaku), SEM (FEI-Quanta 250, FEI), LCR meter (Agilent E4980A), ferroelectric tester (Premier II, Radiant technologies Inc), EPR spectrometer (JES-FA200, JEOL), piezo-d33 meter (ZJ-6A).
4：Experimental Procedures and Operational Workflow:
Powders were ball-milled, pressed into disks, sintered, and poled. Measurements were conducted on the sintered samples.
5：Data Analysis Methods:
XRD patterns were refined by GASA-EXPGUI program. EPR spectra were analyzed using EPR analysis software. Dielectric and piezoelectric properties were calculated from measured data.
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