TY - JOUR
T1 - Thermoelectric properties of the Zintl phases Yb5M2Sb6 (M = Al, Ga, In)
AU - Aydemir, Umut
AU - Zevalkink, Alex
AU - Ormeci, Alim
AU - Wang, Heng
AU - Ohno, Saneyuki
AU - Bux, Sabah
AU - Snyder, G. Jeffrey
N1 - Publisher Copyright:
© The Royal Society of Chemistry 2015.
Copyright:
Copyright 2015 Elsevier B.V., All rights reserved.
PY - 2015/4/21
Y1 - 2015/4/21
N2 - 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
AB - 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
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U2 - 10.1039/c4dt03773a
DO - 10.1039/c4dt03773a
M3 - Article
AN - SCOPUS:84926431417
VL - 44
SP - 6767
EP - 6774
JO - Dalton Transactions
JF - Dalton Transactions
SN - 1477-9226
IS - 15
ER -