Year: 2018
Type: article
Abstract: Ce 1-z Nd z ) y Fe 4-x Co x Sb 12 skutterudites were prepared by encapsulated melting, annealing, and hot pressing.The formation of a marcasite phase (FeSb 2 ) was significantly suppressed by partially filling the voids with Ce/Nd and making a Co substitution at the Fe site.Both the Hall and the Seebeck coefficient values were positive, indicating that all specimens had p-type characteristics.The electrical conductivity decreased with increasing temperatures, as in a degenerate semiconductor.The Seebeck coefficient increased with the charge compensation of Co and filler content of Nd; however, the electrical conductivity decreased.The partially double-filled specimens had a higher electrical conductivity and lower Seebeck coefficient than the completely double-filled specimens, due to the increase in carrier concentration.The lattice thermal conductivity was expected to decrease via partial double filling with Ce and Nd; however, it did not change significantly because of the comparable atomic masses and ionic radii of Ce and Nd.Therefore, the partially double-filled specimens had lattice thermal conductivities comparable to those of the completely double-filled ones.Co substitution had an influence on the ZT values due to the change in the intrinsic conduction onset temperature, which decreased with increasing Co content.Thus, the (Ce 1-z Nd z ) y Fe 4-x Co x Sb 12 skutterudites are a promising material for thermoelectric power generation in the mid-to-low temperature regions.
Source: 대한금속재료학회지
Authors: Ye-Eun Cha, Il-Ho Kim
Institution: Korea National University of Transportation
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: hybrid
OpenAlex ID: W3021472454