Reduction of thermal conductivity by low energy multi-Einstein optic modes

Journal of Materiomics

Sergey A. Danilkin¹  Dehong Yu¹  Chao Wang²  Jiong Yang³  Wenqing Zhang³  Huili Liu⁴  Lidong Chen⁴  Xun Shi⁴ 

[1] Bragg Institute, Australian Nuclear Science and Technology Organisation, Lucas Heights, New South Wales 2234, Australia;Clean Energy Materials and Engineering Center, School of Microelectronics and Solid-State Electronics, University of Electric Science and Technology of China, Chengdu 611731, China;Materials Genome Institute, Shanghai University, Shanghai 200444, China;State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050, China;

关键词: Copper selenide;    Thermoelectric;    Thermal conductivity;    Inelastic neutron scattering;    Multi-Einstein optic phonons;   

DOI  :  10.1016/j.jmat.2016.05.006

来源: DOAJ

【 摘 要 】

The lattice dynamics and thermal transport in Cu2-δSe compounds were investigated via theoretical calculations, neutron measurement, and characterization of thermal properties. The results show that binary ordered Cu2-δSe has an extremely low lattice thermal conductivity at low temperatures. The low energy multi-Einstein optic modes are the dominant approach obtaining such an extremely low lattice thermal conductivity. It is indicated that the damped vibrations of copper ions could contribute to the low energy multi-Einstein optic modes, especially for those low energy branches at 2–4 meV.

【 授权许可】

Unknown