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Power Factor Optimization and Thermoelectric Properties of Mg2Si1-xSnx Alloys by Directional Solidification
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Xi’an Aeronautical University,Xi’an

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    Abstract:

    Single-phase Mg2Si1-xSnx crystal was successfully directionally solidified from the melt. Thermoelectric properties were tested for 1.5at%Bi-doped crystals with different Sn contents, and electronic transport properties were predicted by the first-principle calculation. At x=0.625, tested Seebeck coefficient and power factor is -247μVK-1 and 5.7mWm-1K-2, respectively, because the band structure of Mg2Si0.375Sn0.625 is converged. This result is consistent with the calculated values, and the power factor enhanced 25%. The predicted and tested results of ZT maximum are 1.3 and 1.16 at T=700K, respectively. In the medium temperature range of 550K-800K, the predicted and tested ZT values can keep above 0.9. Power factor optimization is an effective way to improve the thermoelectric properties of Mg2Si1-xSnx crystal. In addition, the performance deterioration of thermoelectric devices induced by nano-sized grain growth at high service temperature can be avoided.

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[Li Xin, Xie Hui, Zhang Yalong, Wei Xin. Power Factor Optimization and Thermoelectric Properties of Mg2Si1-xSnx Alloys by Directional Solidification[J]. Rare Metal Materials and Engineering,2020,49(8):2779~2785.]
DOI:10.12442/j. issn.1002-185X.20191096

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History
  • Received:December 27,2019
  • Revised:March 02,2020
  • Adopted:March 05,2020
  • Online: September 27,2020
  • Published: