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A bismuth ferrite-based lead-free piezoelectric ceramic surpassing PZT-8 in thermal stability
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DOI：10.1039/d5ta09690a.png)
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Abstract
En 中文
Piezoelectric materials are essential for electronics but suffer from thermal instability, especially lead-free alternatives to lead zirconate titanate (PZT). The absence of quantitative thermal stability metrics has hindered progress. In this work, we introduce a new index, denoted as S-d, which accounts for both the operating temperature range and the central operating temperature, allowing for a comprehensive assessment. Applying this criterion, we found that the commercial PZT-4 material exhibits the highest thermal stability among the ceramics tested, confirming its reputation as the industry standard. Notably, we developed a new lead-free piezoelectric ceramic based on bismuth ferrite that achieved a stable piezoelectric coefficient at 38-247 degrees C; the corresponding S-d value (173) exceeds that (163) of commercial PZT-8 (20-232 degrees C). Further analysis revealed that reducing the concentration of point defects improved its electrical homogeneity and reduced conductivity, leading to enhanced thermal stability. This work provides a new evaluation framework that can accelerate the development of thermally stable lead-free piezoelectric materials. The implications of this research extend beyond piezoelectrics, as the S-d index could find broader application in the characterization of other functional oxides.
Keywords:
FIELD-INDUCED STRAIN
HIGH CURIE-TEMPERATURE
FREE PIEZOCERAMICS
FERROELECTRIC CERAMICS
PERFORMANCE
ORIGIN
BOUNDARY
CRYSTALS
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9.5
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3.3W
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21.7W
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