Chemical Synthesis of Iron Antimonide (FeSb2) and Its Thermoelectric Properties

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• 作者：Mohsin Saleemi ; Mohsen Yakhshi Tafti ; Alexandre Jacquot ; Martin Jägle ; Mats Johnsson ; Muhammet S. Toprak
• 刊名：Inorganic Chemistry
• 出版年：2016
• 出版时间：February 15, 2016
• 年：2016
• 卷：55
• 期：4
• 页码：1831-1836
• 全文大小：365K
• ISSN：1520-510X

文摘

Low temperature thermoelectric (TE) materials are in demand for more efficient cooling and power generation applications. Iron antimonide (FeSbub>2ub>) draws great attention over the past few years because of its enhanced power factor values. Polycrystalline bulk FeSbub>2ub> nanopowder was prepared via a low-temperature molten salts approach followed by subsequent thermal treatment in synthetic air and hydrogen gas for calcination and reduction reactions, respectively. Structural analysis confirms the desired final phase with submicrometer grain size and high compaction density after consolidation using spark plasma sintering (SPS). TE transport properties revealed that the material is n-type below 150 K and p-type above this temperature; this suggests antimony vacancies in FeSbub>2ub>. The electrical conductivity increased significantly, and the highest conductivity achieved was 6000 S/cm at 100 K. The maximum figure-of-merit, ZT, of 0.04 is achieved at 500 K, which is about 6 times higher than the earlier reported state-of-the art ZT value for the same material.