Abstract Sb 2 Te 3 bulks with various porosities are synthesized via applying different pressures and processes. Pores defect variations are demonstrated by positron annihilation spectroscopy measurement. Through tuning sintering temperature and pressure exerted in one step or two steps, pores and interfaces of the materials are tailored, which enhances the Seebeck coefficient, simultaneously maintains high electrical conductivity and remarkably reduces thermal conductivity. A maximum ZT of 1.17 is obtained at 523 K for Sb 2 Te 3 samples compacted in two steps under 10 kN, increasing by 54.1% as compared to corresponding sample under 1 kN. Lattice thermal conductivity calculation by modified BET model combining with effective medium theory fits with experiments data, revealing porosity manipulation plays a significant role in reducing thermal conductivity.

中文翻译：

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碲化锑的孔隙率诱导热电性能优化

摘要 通过施加不同的压力和工艺合成了具有不同孔隙率的 Sb 2 Te 3 块体。孔隙缺陷变化通过正电子湮没光谱测量来证明。通过调整一或两步施加的烧结温度和压力，调整材料的孔隙和界面，从而提高塞贝克系数，同时保持高导电性并显着降低热导率。对于在 10 kN 下分两步压实的 Sb 2 Te 3 样品，在 523 K 下获得了 1.17 的最大 ZT，与 1 kN 下的相应样品相比，增加了 54.1%。修正BET模型结合有效介质理论计算晶格热导率与实验数据吻合，