Growth and Thermal Conductivity Study of CuCr2Se4-CuCrSe2 Hetero-Composite Crystals

Crystals

Haomin Lu¹  Ruonan Zhan¹  Minghui Lu¹  Jian Zhou¹  Shuhua Yao¹  Yanyan Zhang¹  Chenghao Yin²  Yangyang Lv²  Yanbin Chen² 

[1] Jiangsu Key Laboratory of Artificial Functional Materials, Department of Materials Science and Engineering, Nanjing University, Nanjing 210093, China;National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China;

关键词: thermal conductivity;    crystal growth;    hetero-composites;    microstructure;   

DOI  :  10.3390/cryst12030433

来源: DOAJ

【 摘 要 】

The CuCrSe₂ shows attractive physical properties, such as thermoelectric and multiferroic properties, but pure-phase CuCrSe₂ crystal is still quite challenging to obtain because CuCr₂Se₄ can be easily precipitated from a CuCrSe₂ matrix. Here, taking the advantage of this precipitation reaction, we grew a series of CuCrSe₂-CuCr₂Se₄ hetero-composites by adjusting growth parameters and explored their thermal conductivity property. Determined by electron-diffraction, the orientation relationship between these two compounds is [001] (100) CuCrSe₂‖[111] (220) CuCr₂Se₄. The out-of-plane thermal conductivity κ of these hetero-composites was measured by a time-domain thermo-reflectance method. Fitting experimental κ by the Boltzmann-Callaway model, we verify that interface scattering plays significant role to κ in CuCrSe₂-CuCr₂Se₄ hetero-composites, while in a CuCrSe₂-dominated hetero-composite, both interface scattering and anharmonic three-phonon interaction lead to the lowest κ therein. Our results reveal the thermal conductivity evolution in CuCr₂Se₄-CuCrSe₂ hetero-composites.

【 授权许可】

Unknown