Year: 2019
Type: article
Abstract: p-Type (La 1-z Nd z ) 0.8 Fe 4-x Co x Sb 12 skutterudites were prepared by partial double filling with La/Nd and charge compensation by substituting Co for Fe.The skutterudite phase was successfully synthesized using encapsulated melting, quenching, annealing and hot-pressing processes, but a small amount of the marcasite phase was identified.Partial filling within the filling fraction limit did not result in the formation of the (La,Nd)Sb 2 phases detected in the fully-filled La 1-z Nd z Fe 4-x Co x Sb 12 because that phase is generated when the La/Nd partial filling exceeds the filling fraction limit.(La 0.25 Nd 0.75 ) 0.8 Fe 4 Sb 12 showed the highest electrical conductivity of 2.32 × 10 5 S m -1 at 323 K, and (La 0.75 Nd 0.25 ) 0.8 Fe 3 CoSb 12 exhibited the largest Seebeck coefficient of 167 µV K -1 at 723 K.The power factors and thermal conductivities of all the specimens were in the range of 1.43-2.59mW m -1 K -2 and 2.05-3.95W m -1 K -1 , respectively, in the temperature range of 323-823 K. (La 0.25 Nd 0.75 ) 0.8 Fe 3 CoSb 12 showed the highest power factor of 2.59 mW m -1 K -2 at 823 K and the lowest thermal conductivity of 2.05 W m -1 K -1 at 323 K. Thus, (La 0.25 Nd 0.75 ) 0.8 Fe 3 CoSb 12 exhibited a maximum dimensionless figure of merit (ZT max ) of 0.76 at 723 K.
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: diamond
OpenAlex ID: W2947441617