Aurivillius phase ceramics exhibit significant potential in high-temperature piezoelectric devices due to their high Curie temperature. However, the rapid decrease in electrical resistivity at high temperatures limits their application. In this work, a series of non-equimolar high-entropy piezoelectric ceramics [Ca_xSr_(1–x)/3Ba_(1–x)/3Pb_(1–x)/3]Bi₄Ti₄O₁₅ were designed and prepared via a conventional solid-state method, and the influence of configurational entropy on the microstructure and electrical properties was investigated. The results show that the pure Aurivillius phase was obtained for all compositions. Due to the hysteretic diffusion effect caused by high entropy design, the grain boundary density is effectively increased, leading to a degradation of electrical transport properties. The results of Raman and TEM indicate that disordered structure and various lattice distortions such as edge dislocations, twists, and tilts of oxygen octahedra coexist in high-entropy ceramics, which synergistically contribute to the increase in ceramic electrical resistivity. Consequently, the electrical resistivity at 500 ℃ increased by 1–2 orders of magnitude, the sample with x = 0.4 exhibits high electrical resistivity (1.18 × 10⁸ Ω·cm), and also boasts a high piezoelectric coefficient (14 pC/N) and an optimal operating temperature (>550 ℃). This work highlights a way to obtain high-performance piezoelectric ceramics with high Curie temperature through the non-equimolar high-entropy composition design.

Superwetting surfaces have the potential to address oil pollution in water, through their ability to separate the two. However, it remains a great challenge to fabricate stable and efficient separation structures using conventional manufacturing techniques. Furthermore, the materials traditionally used for oil-water separation are not stable at high temperature. Therefore, there is a need to develop stable, customizable structures to improve the performance of oil-water separation devices. In recent years, 3D printing technology has developed rapidly, and breakthroughs have been made in the fabrication of complicated ceramic structures using this technology. Here, a ceramic material with a gradient pore structure and superhydrophobic/superoleophilic properties was prepared using 3D printing for high-efficiency oil-water separation. The gradient pore structure developed here can support a flux of up to 25434 L/m²h, which is nearly 40% higher than that an analogous structure with straight pores. At 200 ℃, the oil-water separation performance was maintained at 97.4%. Furthermore, samples of the material exhibited outstanding mechanical properties, and chemical stability in a variety of harsh environments. This study provides an efficient, simple, and reliable method for manufacturing oil-water separation materials using 3D printing, and may have broader implications for both fundamental research and industrial applications.