Optimizing Thermoelectric Properties through Compositional Engineering in Ag-Deficient AgSbTe2 Synthesized by Arc Melting,ACS Applied Electronic Materials

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Optimizing Thermoelectric Properties through Compositional Engineering in Ag-Deficient AgSbTe2 Synthesized by Arc Melting
ACS Applied Electronic Materials ( IF 4.3 ) Pub Date : 2024-03-05 , DOI: 10.1021/acsaelm.3c01653
Jesús Prado-Gonjal ₁ , Elena García-Calvo _{1,

2} , Javier Gainza ₂ , Oscar J Durá ₃ , Catherine Dejoie ₄ , Norbert M Nemes ₅ , José Luis Martínez ₂ , José Antonio Alonso ₂ , Federico Serrano-Sánchez ₂

Affiliation

Thermoelectric materials offer a promising avenue for energy management, directly converting heat into electrical energy. Among them, AgSbTe₂ has gained significant attention and continues to be a subject of research at further improving its thermoelectric performance and expanding its practical applications. This study focuses on Ag-deficient Ag_0.7Sb_1.12Te₂ and Ag_0.7Sb_1.12Te_1.95Se_0.05 materials, examining the impact of compositional engineering within the AgSbTe₂ thermoelectric system. These materials have been rapidly synthesized using an arc-melting technique, resulting in the production of dense nanostructured pellets. Detailed analysis through scanning electron microscopy (SEM) reveals the presence of a layered nanostructure, which significantly influences the thermoelectric properties of these materials. Synchrotron X-ray diffraction reveals significant changes in the lattice parameters and atomic displacement parameters (ADPs) that suggest a weakening of bond order in the structure. The thermoelectric characterization highlights the enhanced power factor of Ag-deficient materials that, combined with the low glass-like thermal conductivity, results in a significant improvement in the figure of merit, achieving zT values of 1.25 in Ag_0.7Sb_1.12Te₂ and 1.01 in Ag_0.7Sb_1.12Te_1.95Se_0.05 at 750 K.

中文翻译：

通过成分工程优化电弧熔炼合成的缺银 AgSbTe2 的热电性能

热电材料为能源管理提供了一条有前途的途径，直接将热量转化为电能。其中，AgSbTe ₂受到了极大的关注，并继续成为进一步提高其热电性能和扩大其实际应用的研究课题。本研究重点关注缺银 Ag _0.7 Sb _1.12 Te ₂和 Ag _0.7 Sb _1.12 Te _1.95 Se _0.05材料，研究成分工程对 AgSbTe ₂热电系统的影响。这些材料已使用电弧熔化技术快速合成，从而生产出致密的纳米结构颗粒。通过扫描电子显微镜（SEM）的详细分析揭示了层状纳米结构的存在，这显着影响了这些材料的热电性能。同步加速器 X 射线衍射揭示了晶格参数和原子位移参数 (ADP) 的显着变化，表明结构中键序的减弱。热电特性突显了缺银材料的功率因数增强，再加上类玻璃导热系数较低，导致品质因数显着改善，Ag _0.7 Sb _1.12 Te ₂和 1.01 的zT值达到 1.25 750 K 时，Ag _0.7 Sb _1.12 Te _1.95 Se _0.05中。

更新日期：2024-03-05

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