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arXiv 2009.03236cond-mat.mtrl-sci
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界面电阻对（1-x）La $_{0.95}$ Sr PDMATHAAB Co $_{0.95}$ Mn $_{0.05}$ O $_3$ /（x）WC复合材料热电性能的影响

Effect of interface resistance on thermoelectric properties in (1-x)La$_{0.95}$Sr$_{0.05}$Co$_{0.95}$Mn$_{0.05}$O$_3$/(x)WC composite

Ashutosh Kumar, Krzysztof T. Wojciechowski

备注：
15 pages, 6 figures, 1 table
发表信息：
J. Eur. Ceram. Soc. 42(10) (2022) 4227-4232
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摘要：

在这项研究中，分散相的颗粒尺寸和相之间的界面热阻（R $_{int}$）对声子热导率（$κ_{ph}$）的（1-x）La $_{0.95}$ Sr $_{0.05}$ Co $_{0.95}$ Mn $_{0.05}$ O $_3$ /（x）WC热电复合材料，证明了协同效应。此外，R $_{int}$和Kapitza半径之间的相关性进行了讨论，使用Bruggeman的不对称模型。特别地，使用标准固态途径合成多晶La $_{0.95}$ Sr $_{0.05}$ Co $_{0.95}$ Mn $_{0.05}$ O $_3$样品。从电子显微镜图像证实了WC纳米颗粒的存在。随着导电WC体积分数的增加，复合材料的电导率（$σ$）增加，Seebeck系数（$α$）减小。随着WC体积分数的增加，$σ$的同时增加和$κ_{ph}$的同时减少导致（1-x）La $_{0.95}$ Sr $_{0.05}$ Co $_{0.95}$ Mn $_{0.05}$ O $_3$ /（x）WC复合材料的品质因数（zT）增加。当x=0.010时，（1-x）La $_{0.95}$ Sr $_{0.05}$ Co $_{0.95}$ Mn $_{0.05}$ O $_3$ /（x）WC复合材料在463 K时的$\sim$最大值为0.20。在本研究中得到的结果表明，希望设计的热电复合材料与所需的声子热导率考虑相之间的弹性性能。

英文摘要：

In this study, the synergistic effect of the particle size of the dispersed phase and the interface thermal resistance (R$_{int}$) between the phases on the phonon thermal conductivity ($κ_{ph}$) of the (1-x)La$_{0.95}$Sr$_{0.05}$Co$_{0.95}$Mn$_{0.05}$O$_3$/(x)WC thermoelectric composite, is demonstrated. Further, the correlation between the R$_{int}$ and the Kapitza radius is discussed using the Bruggeman's asymmetrical model. In particular, the polycrystalline La$_{0.95}$Sr$_{0.05}$Co$_{0.95}$Mn$_{0.05}$O$_3$ sample is synthesized using a standard-solid state route. The presence of WC nanoparticle is confirmed from the electron microscopy images. Electrical conductivity ($σ$) increases, and the Seebeck coefficient ($α$) decreases with the increase in conducting WC volume fraction in the composite. The simultaneous increase in $σ$ and a decrease in $κ_{ph}$ with the WC volume fraction results in an increased figure of merit (zT) for (1-x)La$_{0.95}$Sr$_{0.05}$Co$_{0.95}$Mn$_{0.05}$O$_3$/(x)WC composite. A maximum zT $\sim$ 0.20 is obtained for (1-x)La$_{0.95}$Sr$_{0.05}$Co$_{0.95}$Mn$_{0.05}$O$_3$/(x)WC composite for x=0.010 at 463 K. The results obtained in the present study shows promise to design thermoelectric composites with desired phonon thermal conductivity considering the elastic properties between the phases.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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