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G. Rogl, A. Grytsiv, N. Melnychenko-Koblyuk, E. Bauer, St. Laumann, P. Rogl:
"Compositional dependence of the thermoelectric properties of (Sr_xBa_xYb_{1 − 2x})_yCo₄Sb₁₂ skutterudites";
Journal of Physics: Condensed Matter, 23 (2011), S. 275601-1 - 275601-11.

High temperature thermoelectric (TE) properties for triple-filled skutterudites (SrxBaxYb1 − 2x)yCo4Sb12 were investigated for alloy compositions in two sections of the system: (a) for x = 0.25 with a filling fraction y ranging from 0.1 to 0.25 and (b) for 0 < x < 0.5 and y = 0.11 + 0.259x. The representation of the figure of merit, ZT, as a function of skutterudite composition, defined the compositional range (0.25 < x < 0.4; 0.18 < y < 0.24) with ZT over 1.4 at 800 K. It was shown that an enhanced TE performance for these triple-filled skutterudites is caused by low electrical resistivities and low lattice thermal conductivities, as well as by a fine tuning of the chemical composition. Low temperature measurements for the samples with the highest ZT values showed that even a small change of the filler ratios changes the contribution of scattering effects, the carrier concentration and the mobility.

http://dx.doi.org/10.1088/0953-8984/23/27/27560