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首页> 外文期刊>Journal of Experimental and Theoretical Physics >Thermal Conductivity of Polycrystalline CVD Diamond: Experiment and Theory
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Thermal Conductivity of Polycrystalline CVD Diamond: Experiment and Theory

机译：多晶CVD金刚石的导热系数：实验和理论

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摘要

The temperature dependences of thermal conductivity kappa of polycrystalline CVD diamond are measured in the temperature range from 5 to 410 K. The diamond sample is annealed at temperatures sequentially increasing from 1550 to 1690 degrees C to modify the properties of the intercrystallite contacts in it. As a result of annealing, the thermal conductivity decreases strongly at temperatures below 45 K, and its temperature dependence changes from approximately quadratic to cubic. At T > 45 K, the thermal conductivity remains almost unchanged upon annealing at temperatures up to 1650 degrees C and decreases substantially at higher annealing temperatures. The experimental data are analyzed in terms of the Callaway theory of thermal conductivity [9], which takes into account the specific role of normal phonon-phonon scattering processes. The thermal conductivity is calculated with allowance for three-phonon scattering processes, the diffuse scattering by sample boundaries, the scattering by point and extended defects, the specular scattering by crystallite boundaries, and the scattering by intercrystallite contacts. A model that reproduces the main specific features of the thermal conductivity of CVD diamond is proposed. The phonon scattering by intercrystallite contacts plays a key role in this model.
机译：在5到410 K的温度范围内测量多晶CVD金刚石的导热系数kappa的温度依赖性。将金刚石样品在从1550到1690摄氏度的温度下依次退火，以修改其中的晶间接触的特性。退火的结果是，在低于45 K的温度下，热导率会大大降低，并且其温度依赖性从大约二次变为三次。在T> 45 K时，在高达1650摄氏度的温度下退火时，导热系数几乎保持不变，而在较高的退火温度下，导热系数则显着降低。根据导热系数的卡拉威理论[9]分析了实验数据，该理论考虑了正常声子-声子散射过程的特殊作用。导热系数的计算需要考虑三声子散射过程，样品边界的弥散散射，点缺陷和扩展缺陷的散射，微晶边界的镜面散射以及微晶间接触的散射。提出了一个模型，该模型可再现CVD金刚石导热系数的主要特定特征。晶间接触引起的声子散射在该模型中起关键作用。

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