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Issue 15, 2015
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Thermoelectric properties of the Zintl phases Yb5M2Sb6 (M = Al, Ga, In)

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Abstract

Zintl compounds with chemical formula Yb5M2Sb6 (M = Al, Ga, and In) form one of two known A5M2Pn6 structure types characterized by double chains of corner-linked MPn4 tetrahedra bridged by Pn2 dumbbells. High temperature electronic and thermal transport measurements were used to characterize the thermoelectric properties of Yb5M2Sb6 compounds. All samples were found to exhibit similar high p-type carrier concentrations, low resistivity and low Seebeck coefficients in agreement with the band structure calculations. These results, combined with previous studies, suggest that Yb5M2Sb6 compounds are semimetals (i.e., they lack an energy gap between the valence and conduction bands), in contrast to the semiconducting alkaline earth (Ca, Sr, Ba) and Eu based A5M2Sb6 compounds. Yb5M2Sb6 compounds have very low lattice thermal conductivity, comparable to other closely related A5M2Sb6 and A3MSb3 phases. However, due to the semimetallic behaviour, the figure of merit of investigated samples remains low (zT < 0.15).

Graphical abstract: Thermoelectric properties of the Zintl phases Yb5M2Sb6 (M = Al, Ga, In)

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Publication details

The article was received on 10 Dec 2014, accepted on 29 Jan 2015 and first published on 02 Feb 2015


Article type: Paper
DOI: 10.1039/C4DT03773A
Author version available: Download Author version (PDF)
Citation: Dalton Trans., 2015,44, 6767-6774
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    Thermoelectric properties of the Zintl phases Yb5M2Sb6 (M = Al, Ga, In)

    U. Aydemir, A. Zevalkink, A. Ormeci, H. Wang, S. Ohno, S. Bux and G. J. Snyder, Dalton Trans., 2015, 44, 6767
    DOI: 10.1039/C4DT03773A

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