Journal
ADVANCED MATERIALS
Volume 30, Issue 51, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201805004
Keywords
entropy-stabilized; high-entropy alloys; high-entropy ceramics; thermal conductivity
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Funding
- ONR MURI [N00014-15-1-2863]
- National Science Foundation [CBET-1706388]
- Department of Defense (DoD) through the National Defense Science and Engineering Graduate Fellowship (NDSEG) Program
- NSF Ceramics [1610844]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1610844] Funding Source: National Science Foundation
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Manipulating a crystalline material's configurational entropy through the introduction of unique atomic species can produce novel materials with desirable mechanical and electrical properties. From a thermal transport perspective, large differences between elemental properties such as mass and interatomic force can reduce the rate at which phonons carry heat and thus reduce the thermal conductivity. Recent advances in materials synthesis are enabling the fabrication of entropy-stabilized ceramics, opening the door for understanding the implications of extreme disorder on thermal transport. Measuring the structural, mechanical, and thermal properties of single-crystal entropy-stabilized oxides, it is shown that local ionic charge disorder can effectively reduce thermal conductivity without compromising mechanical stiffness. These materials demonstrate similar thermal conductivities to their amorphous counterparts, in agreement with the theoretical minimum limit, resulting in this class of material possessing the highest ratio of elastic modulus to thermal conductivity of any isotropic crystal.
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