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

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