TY - JOUR
T1 - Novel Synthesis and Processing Effects on the Figure of Merit for NbCoSn, NbFeSb, and ZrNiSn Based Half-Heusler Thermoelectrics
AU - Pedersen, Samuel V.
AU - Croteau, Joseph R.
AU - Kempf, Nicholas
AU - Zhang, Yanliang
AU - Butt, Darryl P.
AU - Jaques, Brian J.
N1 - Peterson, Samuel V.; Croteau, Joseph R.; Kempf, Nicholas; Zhang, Yanliang; Butt, Darryl P.; and Jaques, Brian J. (2020). "Novel Synthesis and Processing Effects on the Figure of Merit for NbCoSn, NbFeSb, and ZrNiSn Based Half-Heusler Thermoelectrics". Journal of Solid State Chemistry, 285, 121203-1 - 121203-9. https://doi.org/10.1016/j.jssc.2020.121203
PY - 2020/5/1
Y1 - 2020/5/1
N2 - The n-type NbCoSn, ZrNiSn and p-type NbFeSb half-Heuslers are promising thermoelectric materials with high figures of merit (ZT) for applications between 575 and 1000 K. By eliminating hafnium and utilizing low cost scalable production methods, the widespread commercialization of high temperature thermoelectrics could be achieved. In this work, half-Heuslers containing refractory metals (Nb and Zr) were produced by high energy planetary ball milling and their thermoelectric performance compared to half-Heuslers prepared by the conventional arc-melting synthesis route. Starting materials, as-milled powders, and consolidated samples were characterized by XRD, SEM, and EDS. The thermoelectric performance parameters were characterized using simultaneous Seebeck and electrical resistivity measurements and laser flash analysis. The mechanically alloyed NbCoSn and NbFeSb achieved ZT of approximately 0.53 (873 K) and 0.72 (873 K), respectively, comparing well to literature and prepared arc-melted monoliths. The results demonstrate mechanical alloying as a viable synthesis technique for refractory metal containing half-Heusler thermoelectrics.
AB - The n-type NbCoSn, ZrNiSn and p-type NbFeSb half-Heuslers are promising thermoelectric materials with high figures of merit (ZT) for applications between 575 and 1000 K. By eliminating hafnium and utilizing low cost scalable production methods, the widespread commercialization of high temperature thermoelectrics could be achieved. In this work, half-Heuslers containing refractory metals (Nb and Zr) were produced by high energy planetary ball milling and their thermoelectric performance compared to half-Heuslers prepared by the conventional arc-melting synthesis route. Starting materials, as-milled powders, and consolidated samples were characterized by XRD, SEM, and EDS. The thermoelectric performance parameters were characterized using simultaneous Seebeck and electrical resistivity measurements and laser flash analysis. The mechanically alloyed NbCoSn and NbFeSb achieved ZT of approximately 0.53 (873 K) and 0.72 (873 K), respectively, comparing well to literature and prepared arc-melted monoliths. The results demonstrate mechanical alloying as a viable synthesis technique for refractory metal containing half-Heusler thermoelectrics.
KW - functional alloys (intermetallics) (half-Heuslers)
KW - mechanical alloying and milling
KW - mechanochemistry
KW - powder metallurgy
KW - thermoelectric properties
UR - https://scholarworks.boisestate.edu/mse_facpubs/420
UR - https://doi.org/10.1016/j.jssc.2020.121203
M3 - Article
JO - Materials Science and Engineering Faculty Publications and Presentations
JF - Materials Science and Engineering Faculty Publications and Presentations
ER -