Effect of point defects on the thermal transport properties of (LaxGd1- x)2Zr2O7 : Experiment and theoretical model
Effect of point defects on the thermal transport properties of (LaxGd1- x)2Zr2O7 : Experiment and theoretical model
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DOI：
10.1103/physrevb.74.144109
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发表时间：
2006-10
影响因子：
3.7
通讯作者：
C. Wan;W. Pan;Q. Xu;Y. -. Qin;J. D. Wang;Z. Qu;M. Fang
中科院分区：
文献类型：
--
作者：
C. Wan;W. Pan;Q. Xu;Y. -. Qin;J. D. Wang;Z. Qu;M. Fang
研究了热障涂层固溶体的热输运特性.点缺陷的引入旨在提供额外的声子散射，并且与和相比，已经获得了低得多的固溶体热导率。在考虑点缺陷散射效应的情况下，对固溶体的声子平均自由程进行了估算和讨论。杨氏模量和热容的固溶体，这决定了平均速度和携带的能量的声子，分别进行了测量，都表现出抑制与终端材料相比，可能是由于晶格弛豫引起的点缺陷。通过考虑点缺陷引起的质量场和应变场波动，建立了一个不含可调参数的理论模型，精确描述了固溶体的热导率。
Thermal transport properties of solid solutionhave been investigated for thermal barrier coatings (TBCs) application. The introduction of point defects was intended to provide extra phonon scattering, and much lower thermal conductivity for the solid solution has been obtained compared withand. The phonon mean free paths of the solid solution were estimated and discussed with respect to the point defect scattering effect. Young’s modulus and heat capacity of the solid solution, which determine the mean velocity and the carried energy of the phonons, respectively, were measured and both showed suppression compared with the end materials, possibly due to the lattice relaxation aroused by point defects. A theoretical model, which contains no adjustable parameters, was present to accurately describe the thermal conductivities of the solid solution by taking account of the mass and strain field fluctuations induced by the point defects.