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arXiv 1809.04762cond-mat.mtrl-sci
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单晶\b{eta} - Ga2O3的三维各向异性热导张量

Three-Dimensional Anisotropic Thermal Conductivity Tensor of Single Crystalline \b{eta}-Ga2O3

Puqing Jiang, Xin Qian, Xiaobo Li, Ronggui Yang

摘要:

近年来,\b{eta} -Ga 2 O 3在高功率电子器件中引起了相当大的兴趣,其中\b{eta} -Ga 2 O 3的热性能起着关键作用。由于单斜晶格结构,预期\b{eta} -Ga 2 O3的热导率是三维(3D)各向异性的。采用时域热反射法(TDTR)测量了(010)取向\b{eta} -Ga 2 O 3单晶的三维各向异性热导率张量。我们的测量结果表明,在室温下,最高的面内热导率沿[001]和[102]之间的方向,值为13.3+/-1.8 W/mK,最低的面内热导率接近[100]方向,值为9.5+/-1.8 W/mK。沿[010]方向的贯通面导热率在所有方向中具有最高值22+/-2.5W/mK。还测量了\b{eta} -Ga 2 O 3的热导率随温度的变化,并与改进的Callaway模型计算进行比较,以了解温度依赖性和杂质散射的作用。

英文摘要:

\b{eta}-Ga2O3 has attracted considerable interest in recent years for high power electronics, where thermal properties of \b{eta}-Ga2O3 play a critical role. The thermal conductivity of \b{eta}-Ga2O3 is expected to be three-dimensionally (3D) anisotropic due to the monoclinic lattice structure. In this work, the 3D anisotropic thermal conductivity tensor of a (010)-oriented \b{eta}-Ga2O3 single crystal was measured by using a novel time-domain thermoreflectance (TDTR) method with a highly elliptical pump beam. Our measured results suggest that at room temperature, the highest in-plane thermal conductivity is along a direction between [001] and [102], with a value of 13.3+/-1.8 W/mK, and the lowest in-plane thermal conductivity is close to the [100] direction, with a value of 9.5+/-1.8 W/mK. The through-plane thermal conductivity, which is along the [010] direction, has the highest value of 22+/-2.5 W/mK among all the directions. Temperature-dependent thermal conductivity of \b{eta}-Ga2O3 was also measured and compared with a modified Callaway model calculation to understand the temperature dependence and the role of impurity scattering.

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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