Paracostibite (CoSbS) is a promising candidate for n-type thermoelectric materials. In this study, a nanostructured CoSbS pellet was fabricated using chemically synthesized Co–Sb–S nanoparticles as building blocks. The CoSbS pellet showed the highest electrical conductivity (σ = 141 S/cm at 661 K) and lowest thermal conductivity [κ ≅ 2 W/(m K)] among the reported CoSbS. Detailed analysis of the electrical transport process in a wide temperature range (3 K–661 K) revealed the existence of a donor level. At a temperature less than 170 K, the resistivity showed Mott variable-range hopping behavior, while the band conduction became dominant as the temperature increased. Nanograins in the pellet significantly enhanced phonon scattering, resulting in suppression of κ. The maximum dimensionless figure of merit value was 0.05 at 661 K, which is comparable with previously reported values for CoSbS TE materials.

中文翻译：

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以化学合成的Co–Sb–S纳米粒子为构建基块制造的副肋辉石的热电特性

副肋石（CoSbS）是n型热电材料的有希望的候选者。在这项研究中，使用化学合成的Co–Sb–S纳米粒子作为结构单元，制造了纳米结构的CoSbS颗粒。CoSbS颗粒显示出最高的电导率（在661 K时σ = 141 S / cm）和最低的热导率[ κ报道的CoSbS中的≅2 W /（m K）]。在较宽的温度范围（3 K–661 K）中对电传输过程的详细分析表明存在供体能级。在低于170 K的温度下，电阻率表现出Mott可变范围跳变行为，而带导随温度升高而占主导地位。颗粒中的纳米颗粒显着增强了声子的散射，从而抑制了κ。最大的无因次品质因数值在661 K时为0.05，与先前报道的CoSbS TE材料的值相当。