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

Umut Aydemir, Alex Zevalkink, Alim Ormeci, Heng Wang, Saneyuki Ohno, Sabah Bux, G. Jeffrey Snyder

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)

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). This journal is

Original languageEnglish
Pages (from-to)6767-6774
Number of pages8
JournalDalton Transactions
Volume44
Issue number15
DOIs
Publication statusPublished - Apr 21 2015
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Inorganic Chemistry

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