There is an urgent need for piezoelectric materials possessing both high piezoelectric properties and good thermal stability to facilitate the advancement of high temperature piezoelectric devices. However, conventional strategy for enhancing piezoelectricity via chemical modifications often comes at the cost of thermal stability due to a drop in Curie temperatures. In this study, we achieved remarkable results in <001>-oriented 0.75BiFeO₃–0.25BaTiO₃ (0.75BF–0.25BT) lead-free textured ceramics. These textured ceramics exhibit a high Curie temperatures T_c of 552 °C, large piezoelectric coefficients d₃₃ of 265 pC/N, and exceptional piezoelectric thermal stability, with minimal variation of 8% across temperature from 25 °C to 300 °C. Compared to randomly oriented ceramics, the piezoelectric coefficient is about 2.5 times higher, marking it as one of the highest reported value for ceramics with T_c near 550 °C. The enhanced piezoelectric properties can be ascribed to improvements in both intrinsic lattice distortions and extrinsic non-180^o domain motions, while the excellent piezoelectric thermal stability is attributed to the stable domain texture. These superior properties of the studied textured 0.75BF–0.25BT ceramics position them as competitive lead-free candidates for high-temperature piezoelectric applications.

中文翻译：

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先进的压电性和出色的热稳定性：<001> 纹理 0.75BF–0.25BT 无铅陶瓷，适用于高温应用


迫切需要兼具高压电性能和良好热稳定性的压电材料，以促进高温压电器件的发展。然而，由于居里温度的下降，通过化学改性增强压电的传统策略通常以牺牲热稳定性为代价。在这项研究中，我们在 <001> 取向的 0.75BiFeO₃–0.25BaTiO₃ （0.75BF–0.25BT） 无铅纹理陶瓷中取得了显着成果。这些纹理陶瓷表现出 552 °C 的高居里温度 T_c、265 pC/N 的大压电系数 d₃₃ 和出色的压电热稳定性，在 25 °C 至 300 °C 的温度范围内变化最小，为 8%。 与随机取向的陶瓷相比，压电系数高出约 2.5 倍，使其成为 T_c 接近 550 °C 的陶瓷的最高报告值之一。 增强的压电性能可归因于本征晶格畸变和外禀非 180^o 域运动的改善，而出色的压电热稳定性则归因于稳定的域织构。所研究的纹理 0.75BF–0.25BT 陶瓷的这些卓越性能使其成为高温压电应用中具有竞争力的无铅候选产品。