Strong interface scattering induced low thermal conductivity in Bi-based GeTe/Bi2Te3 superlattice-like materials
| Autor: | Hao Tong, Zhou Yang, Xiangshui Miao, Xiaomin Cheng, Kaijin Huang, Ming Xu, Zhou Lingjun |
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| Rok vydání: | 2019 |
| Předmět: |
Work (thermodynamics)
Materials science Condensed matter physics Scattering General Chemical Engineering Superlattice 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Thermal diffusivity 01 natural sciences 0104 chemical sciences Thermal conductivity Thermal Perturbation theory 0210 nano-technology Line (formation) |
| Zdroj: | RSC Advances. 9:9457-9461 |
| ISSN: | 2046-2069 |
| Popis: | The thermal conductivities of GeTe/Bi2Te3 superlattice-like materials are calculated based on density functional perturbation theory (DFPT) and measured using a 3ω method. The calculated results show that the lattice thermal conductivity or thermal diffusivity of GeTe/Bi2Te3 superlattice-like materials significantly decrease due to the effects of interfaces and Bi atoms in Bi2Te3. Our measured results are in line with the theoretical calculations, and reach an extremely low thermal conductivity at 0.162 W mK−1 compared with published work on Ge–Sb(Bi)–Te, indicating the effectiveness of modulating the thermal properties of phase change materials by using Bi-based GeTe/Bi2Te3 superlattice-like materials. Our findings give a calculation method to modify the thermal characteristics of superlattice-like materials and confirm Bi-based GeTe/Bi2Te3 superlattice-like materials as promising candidates for phase change materials with lower thermal conductivity. |
| Databáze: | OpenAIRE |
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