Thermoelectric Properties of Zintl Compound YbZn2Sb2 with Mn Substitution in Anionic Framework |
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| Authors: | T. J. Zhu C. Yu J. He S. N. Zhang X. B. Zhao Terry M. Tritt |
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| Affiliation: | (1) State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China;(2) Department of Physics and Astronomy, Clemson University, Clemson, SC 29634, USA |
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| Abstract: | The thermoelectric properties of the Zintl compound YbZn2Sb2 with isoelectronic substitution of Zn by Mn in the anionic (Zn2Sb2)2− framework have been studied. The p-type YbZn2−x Mn x Sb2 (0.0 ≤ x ≤ 0.4) samples were prepared via melting followed by annealing and hot-pressing. Thermoelectric property measurement showed that the Mn substitution effectively lowered the thermal conductivity for all the samples, while it significantly increased the Seebeck coefficient for x < 0.2. As a result, a dimensionless figure of merit ZT of approximately 0.61 to 0.65 was attained at 726 K for x = 0.05 to 0.15, compared with the ZT of ~0.48 in the unsubstituted YbZn2Sb2. |
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| Keywords: | Thermoelectric materials Zintl phases thermoelectric properties substitution |
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