Size disorder as a descriptor for predicting reduced thermal conductivity in medium- and high-entropy pyrochlore oxides

By Andrew J. Wright, Qingyang Wang, Shu-Ting Ko, K. Chung, Renkun Chen, Jian Luo. Scripta Materialia, 2019

285 citations recorded by the source corpus.

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").

Subfields: Aerospace Engineering, Materials Chemistry, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/f2beac655770b917b0e7857b37c0434cace599de

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Aerospace Engineering

1. Jian Luo
2. P. Hopkins
3. Tyler J. Harrington
4. Kenneth S. Vecchio
5. Joshua Gild

In Materials Chemistry

1. P. Hopkins
2. Jian Luo
3. Kenneth S. Vecchio

In Mechanical Engineering

1. Jian Luo
2. Joshua Gild
3. P. Hopkins
4. Tyler J. Harrington
5. Kenneth S. Vecchio

Citations in the corpus

• Dual-phase high-entropy ultra-high temperature ceramics (2020, background): “Most recently, Luo and co-workers propose to further broaden high-entropy ceramics to compositionally-complex ceramics or CCCs [17,32,33].”