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Effect of Hf Concentration on Thermoelectric Properties of Nanostructured N‐Type Half‐Heusler Materials Hf x Zr 1–x NiSn 0.99 Sb 0.01
Author(s) -
Chen Shuo,
Lukas Kevin C.,
Liu Weishu,
Opeil Cyril P.,
Chen Gang,
Ren Zhifeng
Publication year - 2013
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201300336
Subject(s) - materials science , thermoelectric effect , ingot , metallurgy , thermoelectric materials , ball mill , alloy , composite material , thermal conductivity , thermodynamics , physics
Half‐Heusler n‐type thermoelectric materials MNiSn (M = Hf, Zr) have been shown to exhibit peak thermoelectric dimensionless figure‐of‐merit ( ZT ) of ∼1.0 at 600–700 °C with a composition of Hf 0.75 Zr 0.25 NiSn 0.99 Sb 0.01 . This work demonstrates that it is possible to achieve the same ZT by reducing the concentration of the most expensive component Hf to one third of the previously reported best composition, i.e., Hf 0.25 Zr 0.75 NiSn 0.99 Sb 0.01 , which corresponds to an overall 50% reduction on material cost. The samples are prepared by ball milling the arc melted ingot and hot pressing the finely ground powders. The reduction of Hf concentration is crucial for such materials to be used in large‐scale waste heat recovery.