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A novel multi-component lead-free (1-x)BF-xBT-0.01(BNT-20BKT) piezoelectric ceramic exhibits excellent high-temperature piezoelectric properties and thermal stability
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DOI：10.1039/d6tc00181e.png)
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Abstract
En 中文
This paper uses the conventional solid-state reaction method to prepare (1-x)BiFeO3-xBaTiO3-0.01[0.8(Bi0.5Na0.5)TiO3-0.2(Bi0.5K0.5)TiO3]-(referred to as (1-x)BF-xBT-0.01(BNT-20BKT), 0.27 <= x <= 0.35). The influence of BaTiO3 content on the phase structure, dielectric properties, and piezoelectric properties of the BF-BT-BNT-BKT ceramics was systematically investigated. The XRD results indicate that with increasing BaTiO3 content, the material undergoes a composition-induced phase transition from the rhombohedral phase (R) to the pseudocubic phase (PC). Within the composition range 0.27 <= x <= 0.31, a metamorphic phase boundary (MPB) forms where the R phase and PC phase coexist. In situ d33 testing results indicate that at x = 0.31, an ultra-high piezoelectric property of 687.8 pC N-1 was achieved at a real-time depolarisation temperature (Tdr) of 381.8 degrees C, reflecting the ceramic's real-time piezoelectric properties and exceptional high-temperature stability. Transmission electron microscopy results indicate that nanodomains and polar nanodomains play a crucial role in enhancing the piezoelectric response. This study provides novel insights and experimental references for the composition design and phase structure regulation of high-performance lead-free piezoelectric ceramics.
Keywords:
BIFEO3-BATIO3 CERAMICS
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