Recovery of the intrinsic thermoelectric properties of CaMn0.98Nb0.02O3 in 2-terminal geometry using Ag infiltration
Recovery of the intrinsic thermoelectric properties of CaMn0.98Nb0.02O3 in 2-terminal geometry using Ag infiltration
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DOI：
10.1016/j.actamat.2017.04.067
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发表时间：
2017-07
期刊：
影响因子：
9.4
通讯作者：
D. Boldrin;P. Boldrin;E. Ruiz-Trejo;L. Cohen
中科院分区：
文献类型：
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作者：
D. Boldrin;P. Boldrin;E. Ruiz-Trejo;L. Cohen
基于氧化物的热电（TE）材料由于其在高温下的化学和热稳定性、无毒元素、低成本和易于制造而提供优于当前使用的金属间合金的若干优点。然而，将氧化物结合到热电发电机（TEG）中受到诸如对多晶材料的需求超过单晶和大的电极/陶瓷接触电阻的因素的阻碍。后者显著地限制了工作TEG的性能效率。本文报道了渗Ag多晶CaMn_（0.98）Nb_（0.02）O_3陶瓷的TE特性。我们证明，通过使用这种路线，这种材料的固有TE性能完全恢复在2端几何形状通过Ag渗透，从而克服了电极TEG接触问题。该合成路线提供了弥合氧化物的本征TE和TEG器件性质之间的性能差距的机会。
Oxide based thermoelectric (TE) materials offer several advantages over currently used intermetallic alloys due to their chemical and thermal stability at high temperatures, non-toxic elements, low cost and ease of manufacture. However, incorporation of oxides into thermoelectric generators (TEGs) is hindered by factors such as the requirement for polycrystalline materials over single crystals and the large electrode/ceramic contact resistances. The latter significantly limits the performance efficiency of a working TEG. Here we report the TE properties of Ag infiltrated polycrystalline CaMn0.98Nb0.02O3ceramics. We demonstrate that by using this route the intrinsic TE properties of this material are fully recovered in 2-terminal geometry through Ag infiltration, thereby overcoming the electrode TEG contact problem. This synthetic route provides opportunities for bridging the performance gap between the intrinsic TE and TEG device properties of oxides.