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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Thermal conductivity of PbTe-CoSb3 bulk polycrystalline composite: role of microstructure and interface thermal resistance
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Thermal conductivity of PbTe-CoSb3 bulk polycrystalline composite: role of microstructure and interface thermal resistance

机译：PBTE-COSB3散装多晶复合材料的导热系数：微观结构和界面热阻的作用

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摘要

Systematic experimental and theoretical research on the role of microstructure and interface thermal resistance on the thermal conductivity of the PbTe-CoSb3 bulk polycrystalline composite is presented. In particular, the correlation between the particle size of the dispersed phase and interface thermal resistance (R-int) on the phonon thermal conductivity (kappa(ph)) is discussed. With this aim, a series of PbTe-CoSb3 polycrystalline composite materials with different particle sizes of CoSb3 was prepared. The structural (XRD) and microstructural analysis (SEM/EDXS) confirmed the intended chemical and phase compositions. Acoustic impedance difference (Delta Z) was determined from measured sound velocities in PbTe and CoSb3 phases. It is shown that kappa(ph) of the composite may be reduced when particle size of the dispersed phase (CoSb3) is smaller than the critical value of similar to 230 nm. This relationship was concluded to be crucial for controlling the heat transport phenomena in composite thermoelectric materials. The selection of the components with different elastic properties (acoustic impedance) and particle size smaller than Kapitza radius leads to a new direction in the engineering of composite TE materials with designed thermal properties.
机译：对PbTe-CoSb3块体多晶复合材料的微观结构和界面热阻对其导热性能的影响进行了系统的实验和理论研究。特别地，讨论了分散相的粒径和界面热阻（R-int）对声子热导率（kappa（ph））的影响。为此，制备了一系列不同粒径的PbTe-CoSb3多晶复合材料。结构（XRD）和微观结构分析（SEM/EDXS）证实了预期的化学和相组成。声阻抗差（Delta Z）由PbTe和CoSb3相的测量声速确定。结果表明，当分散相（CoSb3）的粒径小于类似于230nm的临界值时，复合材料的kappa（ph）可能会降低。这种关系对于控制复合热电材料中的热传输现象至关重要。选择具有不同弹性特性（声阻抗）和粒径小于Kapitz半径的组分，为具有设计热性能的复合TE材料的工程设计提供了一个新的方向。

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