Nanostructured YbAgCu4 for potentially cryogenic thermoelectric cooling.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 25079115.
- Also identified by DOI 10.1021/nl501436w.
- No licence information is recorded for this record.
- Because redistribution is not established, this page shows the abstract only. Follow the links below for the full text.
Abstract
We have studied the thermoelectric properties of nanostructured YbAgCu4 materials. A high power factor of ∼131 μW cm(-1) K(-2) has been obtained at 22 K for nanostructured samples prepared by ball milling the arc melted ingot into nanopowder and hot pressing the nanopowder. The implementation of nanostructuring method decreased the thermal conductivity at 42 K by 30-50% through boundary scattering comparing with the previously reported value of polycrystalline YbAgCu4. A peak dimensionless thermoelectric figure-of-merit, ZT, of 0.11 has been achieved at 42 K, which may find potential applications for cryogenic cooling below 77 K. The nanostructuring approach can be extended to other heavy Fermion materials to achieve high power factor and low thermal conductivity and ultimately higher ZT.