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

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 g...

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Bibliographic Details
Published in:Crystals (Basel) 2022-03, Vol.12 (3), p.433
Main Authors: Lu, Haomin, Yin, Chenghao, Zhan, Ruonan, Zhang, Yanyan, Lv, Yangyang, Lu, Minghui, Zhou, Jian, Yao, Shuhua, Chen, Yanbin
Format: Article
Language:English
Subjects:
Anharmonicity
Chemical precipitation
Composite materials
Conductivity
crystal growth
Crystal structure
Heat conductivity
Heat transfer
hetero-composites
High temperature
Lasers
microstructure
Physical properties
Ratios
Scattering
Silicon wafers
Single crystals
Spectrum analysis
Thermal conductivity
Time domain analysis
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Summary: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.
ISSN:2073-4352
2073-4352
DOI:10.3390/cryst12030433