2019/12/26 by Andrew Wright, Wright, Andrew J., Qingyang Wang +9 · 2 citations
Engineering · Materials Science · #FOS: Physical sciences #High Entropy Alloys Studies #High-Temperature Coating Behaviors #Materials Science (cond-mat.mtrl-sci) #Nuclear materials and radiation effects
paper · pdf · doi:10.48550/arxiv.1912.11734
openalex publication_date 2019/12/26 · openalex created_date 2020/01/10 · openalex updated_date 2026/07/28
High-entropy ceramics generally exhibit reduced thermal conductivity, but little is known about what controls this suppression and which descriptor can predict it. Herein, 18 medium- and high-entropy pyrochlores were synthesized to measure their thermal conductivity and Young's modulus. Up to 35% reductions in thermal conductivity were achieved with retained moduli, thereby attaining insulative yet stiff properties for potential thermal barrier coating applications. Notably, the measured thermal conductivity correlates well with a modified size disorder parameter. Thus, this modified size disorder parameter is suggested as a useful descriptor for designing thermally-insulative medium- and high-entropy ceramics (broadly defined as "compositionally-complex ceramics").