Recent advances in the study of thermoelectric materials mainly focus on the developments or designs of methods to reduce thermal conductivities. The information of phonon scattering processes is the key to the understanding of the thermal transfer and transport of a material. Such information is essential for the understanding of the thermal conductivity of a material itself and for the further improvement to demand the requirements for technological applications. Recently, palladium sulfide has been examined as a potential thermoelectric material. However, the high thermal conductivity limits its thermoelectric performance and technological applications. Here, Raman scattering spectroscopy is used to investigate the thermal transport properties of this material over a wide range of temperatures. The nonlinear temperature-dependent frequencies and linewidths of the Raman modes illustrate the anharmonicity of phonon scattering for thermal transport in this material. Three-phonon scattering processes are found to account for the thermal transport in the temperature range of 10–620 K. The high-energy bands of the Bg mode related to the light atom (S) contribute most to the thermal transport properties. More phonon scattering processes including higher orders are seemingly needed to further reduce the thermal conductivity of this material.Recent advances in the study of thermoelectric materials mainly focus on the developments or designs of methods to reduce thermal conductivities. The information of phonon scattering processes is the key to the understanding of the thermal transfer and transport of a material. Such information is essential for the understanding of the thermal conductivity of a material itself and for the further improvement to demand the requirements for technological applications. Recently, palladium sulfide has been examined as a potential thermoelectric material. However, the high thermal conductivity limits its thermoelectric performance and technological applications. Here, Raman scattering spectroscopy is used to investigate the thermal transport properties of this material over a wide range of temperatures. The nonlinear temperature-dependent frequencies and linewidths of the Raman modes illustrate the anharmonicity of phonon scattering for thermal transport in this material. Three-phonon scattering processes are f...

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通过拉曼光谱研究热电硫化钯中的声子非谐性

热电材料研究的最新进展主要集中在降低热导率的方法的开发或设计上。声子散射过程的信息是理解材料热传递和传输的关键。这些信息对于了解材料本身的热导率以及进一步改进以满足技术应用的要求至关重要。最近，硫化钯已被研究作为一种潜在的热电材料。然而，高热导率限制了其热电性能和技术应用。在这里，拉曼散射光谱用于研究这种材料在很宽的温度范围内的热传输特性。拉曼模式的非线性温度相关频率和线宽说明了这种材料中热传输的声子散射的非谐性。发现三声子散射过程可以解释 10-620 K 温度范围内的热传输。与光原子 (S) 相关的 Bg 模式的高能带对热传输特性贡献最大。似乎需要更多包括更高阶的声子散射过程来进一步降低这种材料的热导率。热电材料研究的最新进展主要集中在降低热导率的方法的开发或设计上。声子散射过程的信息是理解材料热传递和传输的关键。这些信息对于了解材料本身的热导率以及进一步改进以满足技术应用的要求至关重要。最近，硫化钯已被研究作为一种潜在的热电材料。然而，高热导率限制了其热电性能和技术应用。在这里，拉曼散射光谱用于研究这种材料在很宽的温度范围内的热传输特性。拉曼模式的非线性温度相关频率和线宽说明了这种材料中热传输的声子散射的非谐性。三声子散射过程是...