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Open AccessArticle

Intentional Carrier Doping to Realize n-Type Conduction in Zintl Phases Eu5−yLayIn2.2Sb6

1
School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China
2
State Key Laboratory of Advanced Special Steel, Shanghai University, Shanghai 200444, China
*
Authors to whom correspondence should be addressed.
Materials 2019, 12(2), 264; https://doi.org/10.3390/ma12020264
Received: 18 December 2018 / Revised: 9 January 2019 / Accepted: 14 January 2019 / Published: 15 January 2019
(This article belongs to the Special Issue Electroceramic Materials)
Due to the tunable electrical transport properties and lower thermal conductivity, Zintl phase compounds have been considered as a promising candidate for thermoelectric applications. Most Sb-based Zintl compounds exhibit essentially p-type conduction as result of the cation vacancy. Herein, n-type Zintl phases Eu5−yLayIn2.2Sb6 has been successfully synthesized via controlling the vacancy defect combined with intentional electron doping. Excess of In would occupy the vacancy while La doping enables the electron to be the major carrier at the measured temperate range, realizing the n-type conduction for Eu5−yLayIn2.2Sb6 (y ≥ 0.04). Meanwhile, the thermal conductivity of Eu5−yLayIn2.2Sb6 reduces from 0.90 W/mK to 0.72 W/mK at 583 K derived from the La doping-induced disorder. The maximum thermoelectric figure of merit zT = 0.13 was obtained. This work firstly realizes the n-type conduction in Eu5In2Sb6, which sheds light on the strategy to synthesize n-type Zintl thermoelectric materials and promotes the practical applications of Zintl thermoelectric devices. View Full-Text
Keywords: Eu5In2Sb6; Zintl phase; n-type; thermoelectric properties Eu5In2Sb6; Zintl phase; n-type; thermoelectric properties
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MDPI and ACS Style

Lin, J.; Lv, W.; Gu, Y.; Guo, K.; Yang, X.; Zhao, J. Intentional Carrier Doping to Realize n-Type Conduction in Zintl Phases Eu5−yLayIn2.2Sb6. Materials 2019, 12, 264.

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