Spiridigliozzi Luca, Monfreda Viviana, Marocco Antonello, Milano Filippo, Vendittelli Antonio, Dell'Agli Gianfranco
Department of Civil and Mechanical Engineering, University of Cassino and Southern Lazio, Via G. Di Biasio 43, 03043 Cassino, Italy.
National Interuniversity Consortium of Materials Science and Technology (INSTM), Via G. Giusti 9, 50121 Florence, Italy.
Materials (Basel). 2025 Jun 5;18(11):2663. doi: 10.3390/ma18112663.
This study explores the influence of two different synthesis methods on the sintering behavior of three novel high-entropy oxides possibly suitable for thermal barrier applications: (CeZrYbErNd)O, (CeZrYbErLa)O, and (CeNdYbErLa)O. Rare-Earth-based High-Entropy Oxides (RE-HEOs), recently known for their exceptional thermal stability and compositional flexibility, have gained increasing attention as potential candidates for many advanced technological applications. Thus, our current work focuses on the specific effects of synthesis techniques, namely co-precipitation and hydrothermal treatment, on the entropy-driven stabilization, microstructure, electrochemical properties, and sintering behavior of three novel RE-HEOs. The obtained results reveal significant differences in terms of densification yield and of the obtaining of the designed entropy-stabilized single phase depending on the adopted synthesis route, underscoring the critical role of synthesis in optimizing RE-HEOs for near-future technological applications.
(CeZrYbErNd)O、(CeZrYbErLa)O和(CeNdYbErLa)O。基于稀土的高熵氧化物(RE-HEOs)，最近因其卓越的热稳定性和成分灵活性而闻名，作为许多先进技术应用的潜在候选材料受到了越来越多的关注。因此，我们目前的工作重点是合成技术，即共沉淀和水热处理，对三种新型RE-HEOs的熵驱动稳定性、微观结构、电化学性能和烧结行为的具体影响。所得结果表明，根据所采用的合成路线，在致密化产率和获得设计的熵稳定单相方面存在显著差异，突出了合成在优化RE-HEOs以用于近期技术应用中的关键作用。
