Year: 2018
Type: article
Abstract: Partially La/Pr-double-filled and Co-substituted (La 1-z Pr z ) 0.8 Fe 4-x Co x Sb 12 skutterudites were synthesized by encapsulated melting and vacuum hot pressing.(La,Pr)Sb 2 phases were not formed because the partial filling did not exceed the filling fraction limit, and the amount of secondary phase FeSb 2 also decreased as the Co content increased.Electrical conductivity decreased with increasing Pr filling and Co substitution because of the decreased carrier concentration.The (La 0.75 Pr 0.25 ) 0.8 Fe 4 Sb 12 skutterudite, which was not charge-compensated with Co, showed the highest electrical conductivity of 2.44 × 10 5 Sm -1 at 323 K.In contrast, the Seebeck coefficient increased with increased Co substitution, and the (La 0.25 Pr 0.75 ) 0.8 Fe 3 CoSb 12 exhibited the maximum Seebeck coefficient of 168.2 µVK -1 at 723 K; (La 0.75 Pr 0.25 ) 0.8 Fe 3.5 Co 0.5 Sb 12 exhibited the highest power factor of 2.67 mW m -1 K -2 at 823 K; and (La 0.25 Pr 0.75 ) 0.8 Fe 3 CoSb 12 exhibited the lowest thermal conductivity of 2.09 W m -1 K -1 at 523 K. Consequently, (La 0.25 Pr 0.75 ) 0.8 Fe 3.5 Co 0.5 Sb 12 exhibited the maximum dimensionless figure of merit, ZT = 0.79 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: hybrid
OpenAlex ID: W2897498820