NDLI: Thermoelectric properties of double-filled Pr$_{1-z }$Nd$_{ z }$Fe$_{4-x }$Co$_{ x }$Sb$

Content Provider	Springer Nature Link
Author	Shin, Dong Kil Kim, Il Ho
Copyright Year	2015
Abstract	Pr$_{1-z }$Nd$_{ z }$Fe$_{4-x }$Co$_{ x }$Sb12 (z = 0.25, 0.5, 0.75 and x = 0, 0.5, 1.0) skutterudites were synthesized by encapsulated melting and annealing, and were consolidated by hot pressing. The effects of Pr/Nd double filling and Co substitution for Fe (charge compensation) on the electronic transport and the thermoelectric properties were examined. The main phase of all specimens was the skutterudite phase, but a small amount of the FeSb$_{2}$ phase was also found. An increase in the Co content suppressed the formation of the FeSb$_{2}$ phase, but the (Pr,Nd)Sb$_{2}$ phase was also produced in the Pr$_{1-z }$Nd$_{ z }$Fe$_{3}$CoSb$_{12}$ specimens. Pr and Nd were confirmed to have successfully double-filled the voids and Co was confirmed to have substituted for Fe because the lattice constant decreased with increases in the Nd and the Co contents. The electrical conductivity slightly decreased as the temperature was increased, showing a degenerate semiconductor behavior. The Hall coefficient and the Seebeck coefficient showed positive signs, indicating that the major carriers were holes (p-type conduction). Although the electronic transport properties rarely changed with the Pr and the Nd filling fractions, the Seebeck coefficient increased slightly because the effective carrier mass increased as the Pr content was increased. Moreover, the Seebeck coefficient increased due to a decrease in the carrier concentration as the Co content was increased while the electrical conductivity and the thermal conductivity decreased. The maximum power factor, PF = 3.1 mWm $^{-1}$K $^{-2}$, and the maximum dimensionless figure of merit, ZT = 0.83, were obtained at 823 K for Pr$_{0.75}$Nd$_{0.25}$Fe$_{4}$Sb$_{12}$.
Starting Page	1879
Ending Page	1884
Page Count	6
File Format	PDF
ISSN	03744884
Journal	Journal of the Korean Physical Society
Volume Number	66
Issue Number	12
e-ISSN	19768524
Language	English
Publisher	The Korean Physical Society
Publisher Date	2015-07-09
Publisher Place	Seoul
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Charge compensation Double filling Theoretical, Mathematical and Computational Physics Skutterudite Thermoelectric Physics Particle and Nuclear Physics
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy

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