TY  - JOUR
AU  - Zhang, Luyang
AU  - Chen, Lin
AU  - Wang, Jiankun
AU  - Zhang, Yuxuan
AU  - Chu, Yanhui
AU  - Feng, Jing
PY  - 2025
TI  - High entropy engineering boosts thermo-mechanical properties of rare-earth tantalates: Influences of cocktail effects
JO  - Journal of Materiomics
SN  - 2352-8478
VL  - 11
IS  - 4
AB  - High entropy engineering has been widely used to optimize properties of various materials, and we improve comprehensive performance of rare-earth tantalates RETaO4 (RE is rare earth) by changing configurational entropy in this work. Four medium/high entropy RETaO4 (M/HERT) are successfully prepared, and the variations of disorders and distortion degree of lattices with the increasing configurational entropy are described in detail. It is revealed that M/HERT with the highest configurational entropy does not correspond to the best comprehensive properties. Unexpected variations in properties of M/HERT compared to RETaO4 are observed. By comparing with values obtained from rule of mixture (ROM), it is believed that the cocktail effect exists in M/HERT. The synergistic optimizations of thermo-mechanical properties are realized, including reducing thermal conductivity, increasing thermal expansion coefficients (TECs), and enhancing mechanical properties. M/HERT exhibit excellent high temperature stability and provide a good thermal insulation gradient, which is significant for high-temperature applications of RETaO4. This work serves as an important part for thermal barrier coatings materials with high working temperatures and low thermal conductivity.
UR  - https://doi.org/10.1016/j.jmat.2024.100984
DO  - 10.1016/j.jmat.2024.100984