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Charge‐Induced Disorder Controls the Thermal Conductivity of Entropy‐Stabilized Oxides
Advanced Materials ( IF 29.4 ) Pub Date : 2018-10-17 , DOI: 10.1002/adma.201805004
Jeffrey L Braun 1 , Christina M Rost 1 , Mina Lim 2 , Ashutosh Giri 1 , David H Olson 1 , George N Kotsonis 2, 3 , Gheorghe Stan 4 , Donald W Brenner 2 , Jon-Paul Maria 2, 3 , Patrick E Hopkins 1
Affiliation  

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.

中文翻译:

电荷诱导无序控制熵稳定氧化物的热导率

通过引入独特的原子种类来操纵晶体材料的构型熵可以产生具有理想机械和电学性能的新型材料。从热传输的角度来看,质量和原子间力等元素性质之间的巨大差异会降低声子携带热量的速率,从而降低热导率。材料合成的最新进展使熵稳定陶瓷的制造成为可能,为理解极端无序对热传输的影响打开了大门。测量单晶熵稳定氧化物的结构、机械和热性能,结果表明局部离子电荷无序可以有效降低热导率而不影响机械刚度。
更新日期:2018-10-17
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