固溶体
声子
材料科学
凝聚态物理
散射
格子(音乐)
晶体缺陷
热导率
物理
热力学
热的
光学
声学
冶金
作者
Chao Wan,Wei Pan,Qiang Xu,Yong Qin,J. D. Wang,Zhe Qu,Minghao Fang
出处
期刊:Physical Review B
[American Physical Society]
日期:2006-10-30
卷期号:74 (14)
被引量:266
标识
DOI:10.1103/physrevb.74.144109
摘要
Thermal transport properties of solid solution ${({\mathrm{La}}_{x}{\mathrm{Gd}}_{1\ensuremath{-}x})}_{2}{\mathrm{Zr}}_{2}{\mathrm{O}}_{7}$ have 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 with ${\mathrm{La}}_{2}{\mathrm{Zr}}_{2}{\mathrm{O}}_{7}$ and ${\mathrm{Gd}}_{2}{\mathrm{Zr}}_{2}{\mathrm{O}}_{7}$. 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.
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