NbFeSb-based p-type half-Heuslers for power generation applications

• DOI: 10.1039/c4ee02180k
• Publication Date: 2014-10-13T12:30:15Z
• Authors: Giri Joshi; Ran He; Michael Engber; Georgy Samsonidze; Tej Pantha; Ekraj Dahal; Keshab Dahal; Jian Yang; Yucheng Lan; Boris Kozinsky; Zhifeng Ren
• Keywords: Ingot; Figure of Merit; Dimensionless quantity

We report a peak dimensionless figure-of-merit (ZT) of ∼1 at 700 °C in nanostructured p-type Nb0.6Ti0.4FeSb0.95Sn0.05 composition. Even though the power factor composition is improved by 25%, comparison to previously reported Hf0.44Zr0.44Ti0.12CoSb0.8Sn0.2, ZT value not increased due higher thermal conductivity. However, led 15% increase output thermoelectric device made from previous best material Hf0.44Zr0.44Ti0.12CoSb0.8Sn0.2. The n-type used make unicouple Hf0.25Zr0.75NiSn0.99Sb0.01 with lowest hafnium (Hf) content. Both p- and samples are prepared ball milling arc melted ingot hot pressing finely ground powders. Moreover, raw cost more than six times lower compared This reduction crucial for these materials be large-scale quantities vehicle industrial waste heat recovery applications.