Dependence of the thermoelectric properties of CeFe3.5Co0.5Sb12 on the parameters of mechanochemical synthesis and spark plasma sintering
Scherbakova K. A.1, Chernyshova E. V. 1, Argunov E. V.1, Bochkanov F. Y. 1, Voronin A. I.1, Khovaylo V. V.1
1National University of Science and Technology MISiS, Moscow, Russia
Email: m1804497@edu.misis.ru
p-type skutterudite of CeFe3.5Co0.5Sb12 nominal composition was prepared by mechanochemical synthesis and spark plasma sintering. Compared to traditional synthesis methods, the proposed approach makes it possible to reduce the time for preparation of skutterudite thermoelectrics by more than an order of magnitude. By varying both the grinding time and the sintering temperature, it was possible to reduce the amount of secondary phases FeSb2 and Sb, the presence of which has a negative effect on the Seebeck coefficient in particular and on the thermoelectric figure of merit in general. The highest value of thermoelectric figure of merit, zT=0.4 at 773 K, demonstrated the sample obtained after 30 minutes of grinding and sintered at 798 K. Keywords: p-type skutterudites, mechanochemical synthesis, spark plasma sintering, thermoelectric properties.
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