Nano-particles and defects have effective influence on reducing the lattice thermal conductivity. In this work, a serious of high concentration Te doping bulk polycrystalline materials Co₄Sb_11.2Te_0.8 has been synthesized successfully at different pressures by the high pressure and high temperature (HPHT) method. All samples were characterized by X-ray diffraction. The Seebeck coefficient α, electrical resistivity ρ and thermal conductivity κ were all measured from 373 K to 673 K. It could be observed obviously that, as the synthesis pressure rised, the thermal conductivity of Co₄Sb_11.2Te_0.8 decreased remarkably. The minimum thermal conductivity of 1.36 W m⁻¹ K⁻¹ was obtained by Co₄Sb_11.2Te_0.8 sample synthesized at 3.7 GPa. The corresponding microstructures were also studied by SEM and HRTEM images.

纳米颗粒和缺陷对降低晶格热导率具有有效的影响。在这项工作中，通过高压和高温（HPHT）方法成功地在不同压力下合成了大量的高浓度Te掺杂块状多晶材料Co ₄ Sb _11.2 Te _0.8。所有样品均通过X射线衍射表征。塞贝克系数α，电阻率ρ和热导率κ都在373  K至673  K范围内测量。显然，随着合成压力的升高，Co ₄ Sb _11.2 Te _0.8的热导率显着下降。最小导热系数1.36 W  m ^-1  K ^-1是通过以3.7 GPa合成的Co ₄ Sb _11.2 Te _0.8样品获得的 。还通过SEM和HRTEM图像研究了相应的微观结构。