Anisotropically electrical property of Anderson insulator state in Bi2Ca2-xSrxCo2Oy (x=0.0, 0.5, 1.0, 1.5, 2.0) single crystals

Dong, Song‐Tao; Wei, Junlin; Yu, Miao-Cheng; Lv, Yang‐Yang; Yao, Shu‐Hua; Zhang, Bin-Bin; Chen, Y.B.

doi:10.1016/j.jallcom.2020.155450

Cited by 2 publications

(1 citation statement)

References 27 publications

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“…Thus, developing high-performance TE materials and improving their TE properties has become an important research focus. Based on the concept of a phonon glass electronic crystal, layered materials can separately regulate electrical and thermal conductivities, thereby producing TE materials with excellent TE performance [7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Effect of Ta Doping on the Microstructure and Thermoelectric Properties of Bi2O2Se

Jiang

Dong

et al. 2022

Metals

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In this study, Bi2−xTaxO2Se (x = 0, 0.02, 0.04, 0.06, and 0.08) ceramics were prepared using a synthesis method combining high-energy ball milling and cold pressing. Furthermore, the effects of tantalum (Ta) doping on the microstructure and thermoelectric properties of Bi2O2Se were systematically investigated. The results indicate that Ta doping effectively improves the carrier concentration and mobility, thus increasing the electrical conductivity from 8.75 S cm−1 to 39.03 S cm−1 at 323 K. Consequently, the power factor is improved, reaching a maximum value of 124 μW m−1 K−2 for the Bi1.92Ta0.08O2Se sample at 773 K. Moreover, the thermal conductivity of Bi1.96Ta0.04O2Se is reduced to 0.50 Wm−1 K−1. Finally, the maximum dimensionless figure of merit (ZT) value of the Bi1.94Ta0.06O2Se sample reached 0.18, which was 64% higher than that of Bi2O2Se (0.11). These results indicate that Ta doping and high-energy ball milling can optimize the electrical and thermal properties and thus improve the thermoelectric properties of ceramics.

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