Charge‐Induced Disorder Controls the Thermal Conductivity of Entropy‐Stabilized Oxides
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- Jeffrey L. Braun
- Department of Mechanical and Aerospace Engineering University of Virginia Charlottesville VA 22904 USA
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- Christina M. Rost
- Department of Mechanical and Aerospace Engineering University of Virginia Charlottesville VA 22904 USA
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- Mina Lim
- Department of Materials Science and Engineering North Carolina State University Raleigh NC 27695 USA
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- Ashutosh Giri
- Department of Mechanical and Aerospace Engineering University of Virginia Charlottesville VA 22904 USA
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- David H. Olson
- Department of Mechanical and Aerospace Engineering University of Virginia Charlottesville VA 22904 USA
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- George N. Kotsonis
- Department of Materials Science and Engineering North Carolina State University Raleigh NC 27695 USA
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- Gheorghe Stan
- Material Measurement Laboratory National Institute of Standards and Technology Gaithersburg MD 20899 USA
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- Donald W. Brenner
- Department of Materials Science and Engineering North Carolina State University Raleigh NC 27695 USA
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- Jon‐Paul Maria
- Department of Materials Science and Engineering North Carolina State University Raleigh NC 27695 USA
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- Patrick E. Hopkins
- Department of Mechanical and Aerospace Engineering University of Virginia Charlottesville VA 22904 USA
説明
<jats:title>Abstract</jats:title><jats:p>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.</jats:p>
収録刊行物
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- Advanced Materials
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Advanced Materials 30 (51), 1805004-, 2018-10-17
Wiley