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Local structural engineering for simultaneous enhancement of piezoelectricity and temperature stability in BiScO3-PbTiO3 piezoceramics
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DOI：10.1016/j.jmst.2025.11.060.png)
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Abstract
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High-performance piezoelectric materials that maintain stable operation across a broad temperature range are critical for the reliable functioning of high-temperature devices. Over the past few decades, achieving both superior piezoelectric properties and a high Curie temperature simultaneously has remained a significant challenge. In this work, BS-PT ceramics exhibit a large piezoelectric coefficient (509 pC/N) together with a high Curie temperature (407°C). Furthermore, upon powder refinement, both the piezoelectric coefficient (602 pC/N) and temperature stability of BS-PT ceramics are enhanced, while the high Curie temperature (414 °C) is well retained. Atomic resolution scanning transmission electron microscopy and dynamic thermomechanical analysis reveal that powder refinement induces a transition toward a quasi-isotropic local polarization distribution, which facilitates polarization rotation among different local symmetries and reduces the energy barrier between coexisting phases, thereby leading to improved piezoelectric properties. The enhanced temperature stability is attributed to the competing effects among polarization macrodomain coalescence, lattice activation and expansion, and domain activation. This work studies a novel strategy to synergistically improve both piezoelectric properties and temperature stability without chemical modification, offering valuable insights for the design and development of high-temperature piezoelectric ceramics.
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