α-MgAgSb is a promising near-room temperature thermoelectric material, characterized by its intrinsically low lattice thermal conductivity, a feature attributed to the significant atomic mass contrast and complex crystal structure. In this work, we achieved respective values of 0.58 in the temperature range of 150–300 K and 1.22 in the range of 300–550 K for α-MgAgSb, indicating exceptional potential for both cooling and power generation applications. Additionally, through the reduction of cross-sectional size, the stability of MgAgSb/Ag interface was enhanced under high temperature, which is crucial for the practical application of thermoelectric module. To verify the property of α-MgAgSb material, a 7-pair MgAgSb/BiTe module was fabricated, demonstrating a maximum cooling temperature difference Δ of 60 K at hot-side temperature of 300 K and a power generation efficiency of 7.2 % with Δ of 275 K. This work paves the way for the application of Mg-based thermoelectric materials.

中文翻译：

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具有固有低晶格热导率的α-MgAgSb的高冷却和发电性能


α-MgAgSb是一种有前途的近室温热电材料，其特征在于其本质上较低的晶格热导率，这一特征归因于显着的原子质量对比和复杂的晶体结构。在这项工作中，我们在 150–300 K 的温度范围内实现了 α-MgAgSb 的值 0.58，在 300–550 K 的温度范围内实现了 1.22，这表明 α-MgAgSb 在冷却和发电应用方面具有非凡的潜力。此外，通过减小横截面尺寸，增强了MgAgSb/Ag界面在高温下的稳定性，这对于热电模块的实际应用至关重要。为了验证α-MgAgSb材料的性能，制作了7对MgAgSb/BiTe模块，在热端温度为300 K时，最大冷却温差Δ为60 K，发电效率为7.2%，Δ为275 K。这项工作为镁基热电材料的应用铺平了道路。