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Enhancement of Thermoelectric Properties in Pd−In Co-Doped SnTe and Its Phase Transition Behavior

Journal Article


Abstract


  • SnTe has attracted more and more attention due to the similar band and crystal structure with high performance thermoelectric materials PbTe. Here, we introduced Pd into SnTe and the valence band convergence was confirmed by first-principles calculation. In the experimental process, we found that Pd-doped SnTe exhibit a reduced thermal conductivity because of softening chemical bonds and grain refining effects. To further improve the thermoelectric performance, Pd-In codoped SnTe samples were prepared, and the abnormal change of thermal conductivity was observed. The results of synchrotron powder diffraction suggest that the local phase transition (local structural distortions) near 400 K results in the first turn on thermal conductivity. Similarly, the second local phase transition in near 600 K observed by neutron powder diffraction lead to a decrease thermal conductivity of the sample. Finally, a peak thermoelectric figure of merit (ZT) ≈ 1.51 has been obtained in Sn0.98Pd0.025In0.025Te at 800 K.

Authors


  •   Ma, Zheng (external author)
  •   Lei, Jingdan (external author)
  •   Zhang, De (external author)
  •   Wang, Chao (external author)
  •   Wang, Jian Li.
  •   Cheng, Zhenxiang
  •   Wang, Yuanxu (external author)

Publication Date


  • 2019

Citation


  • Ma, Z., Lei, J., Zhang, D., Wang, C., Wang, J., Cheng, Z. & Wang, Y. (2019). Enhancement of Thermoelectric Properties in Pd−In Co-Doped SnTe and Its Phase Transition Behavior. ACS Applied Materials and Interfaces, 11 (37), 33792-33802.

Scopus Eid


  • 2-s2.0-85072508371

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/3826

Number Of Pages


  • 10

Start Page


  • 33792

End Page


  • 33802

Volume


  • 11

Issue


  • 37

Place Of Publication


  • United States

Abstract


  • SnTe has attracted more and more attention due to the similar band and crystal structure with high performance thermoelectric materials PbTe. Here, we introduced Pd into SnTe and the valence band convergence was confirmed by first-principles calculation. In the experimental process, we found that Pd-doped SnTe exhibit a reduced thermal conductivity because of softening chemical bonds and grain refining effects. To further improve the thermoelectric performance, Pd-In codoped SnTe samples were prepared, and the abnormal change of thermal conductivity was observed. The results of synchrotron powder diffraction suggest that the local phase transition (local structural distortions) near 400 K results in the first turn on thermal conductivity. Similarly, the second local phase transition in near 600 K observed by neutron powder diffraction lead to a decrease thermal conductivity of the sample. Finally, a peak thermoelectric figure of merit (ZT) ≈ 1.51 has been obtained in Sn0.98Pd0.025In0.025Te at 800 K.

Authors


  •   Ma, Zheng (external author)
  •   Lei, Jingdan (external author)
  •   Zhang, De (external author)
  •   Wang, Chao (external author)
  •   Wang, Jian Li.
  •   Cheng, Zhenxiang
  •   Wang, Yuanxu (external author)

Publication Date


  • 2019

Citation


  • Ma, Z., Lei, J., Zhang, D., Wang, C., Wang, J., Cheng, Z. & Wang, Y. (2019). Enhancement of Thermoelectric Properties in Pd−In Co-Doped SnTe and Its Phase Transition Behavior. ACS Applied Materials and Interfaces, 11 (37), 33792-33802.

Scopus Eid


  • 2-s2.0-85072508371

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/3826

Number Of Pages


  • 10

Start Page


  • 33792

End Page


  • 33802

Volume


  • 11

Issue


  • 37

Place Of Publication


  • United States