Thermoelectric Properties of Scandium Sesquitelluride
Thermoelectric Properties of Scandium Sesquitelluride
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DOI：
10.3390/ma12050734
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发表时间：
2019-03-01
期刊：
影响因子：
3.4
通讯作者：
Bux, Sabah K.
中科院分区：
文献类型：
--
作者：
Cheikh, Dean;Lee, Kathleen;Bux, Sabah K.
稀土（RE）碲化物已被广泛研究用于高温热电应用。具体而言，具有 Th3P4 结构类型的镧和镨基化合物在 1200 K 时表现出高达 1.7 的无量纲热电品质因数 (zT)。钪虽然不属于镧系元素系列，但由于其化学相似性而被视为稀土元素。然而，人们对钪碲化物的热电性质知之甚少。在这里，我们使用机械化学方法合成了倍半碲化钪（Sc2Te3），并通过放电等离子烧结（SPS）形成烧结体。在 300-1100 K 范围内测量了与温度相关的热电性能。由于在中温范围内具有可观的功率因数和低晶格热导率，Sc2Te3 在 500-750 K 的宽范围内表现出峰值 zT = 0.3。
Rare-earth (RE) tellurides have been studied extensively for use in high-temperature thermoelectric applications. Specifically, lanthanum and praseodymium-based compounds with the Th3P4 structure type have demonstrated dimensionless thermoelectric figures of merit (zT) up to 1.7 at 1200 K. Scandium, while not part of the lanthanide series, is considered a RE element due to its chemical similarity. However, little is known about the thermoelectric properties of the tellurides of scandium. Here, we synthesized scandium sesquitelluride (Sc2Te3) using a mechanochemical approach and formed sintered compacts through spark plasma sintering (SPS). Temperature-dependent thermoelectric properties were measured from 300-1100 K. Sc2Te3 exhibited a peak zT = 0.3 over the broad range of 500-750 K due to an appreciable power factor and low-lattice thermal conductivity in the mid-temperature range.