Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

The Layered Oxyselenide BiCuSeO Has Garnered Significant Interest Because of Its Ability to Exhibit Low Thermal Conductivity and a High Seebeck Coefficient. This Study Involved the Preparation of Bi1−xNaxCuSeO1−xFx(x=0, 0.05, 0.10, 0.15, and 0.20) Ceramic

Zhenbing Pei
,
Guangqi Xiang
,
Xin Sun
,
Zhuang Fu
,
Yanxin Qiao
ORCID logo ,
Lei Wang
ORCID logo ,
Songtao Dong
* ORCID logo ,
Jian Chen
Version 1 : Received: 7 November 2023 / Approved: 7 November 2023 / Online: 7 November 2023 (09:41:03 CET)

A peer-reviewed article of this Preprint also exists.

Pei, Z.; Xiang, G.; Sun, X.; Fu, Z.; Qiao, Y.; Wang, L.; Dong, S.; Chen, J. Effect of NaF Doping on the Microstructure and Thermoelectric Performance of BiCuSeO Ceramics. Coatings 2023, 13, 2069. Pei, Z.; Xiang, G.; Sun, X.; Fu, Z.; Qiao, Y.; Wang, L.; Dong, S.; Chen, J. Effect of NaF Doping on the Microstructure and Thermoelectric Performance of BiCuSeO Ceramics. Coatings 2023, 13, 2069.

Abstract

The layered oxyselenide BiCuSeO has garnered significant interest because of its ability to exhibit low thermal conductivity and a high Seebeck coefficient. This study involved the preparation of Bi1−xNaxCuSeO1−xFx(x=0, 0.05, 0.10, 0.15, and 0.20) ceramics through the processes of high energy ball milling and cold isostatic pressing. A systematic study was conducted to investigate the impact of co−doping Na/F on the thermoelectric performance of BiCuSeO ceramics. Replacing Bi3+ with Na+ results in the introduction of a considerable amount of holes, leading to a notable enhancement in the electrical conductivity and power factor. The conductivity was significantly increased from 9.10 S cm−1 in the pure BiCuSeO to 94.5 S cm−1 in Bi0.85Na0.15CuSeO0.85F0.15 at 323 K. At 823 K, the power factor of the Bi0.85Na0.15CuSeO0.85F0.15 sample achieved 44.8×10−5 W/ m K2. Moreover, the Bi1−xNaxCuSeO1−xFx ceramics exhibit a minimum thermal conductivity of 0.43 W m−1 K−1. As a result, the Bi0.85Na0.15CuSeO0.85F0.15 sample achieves a maximum ZT value of 0.78, which is 7.09 times greater than that of the pure BiCuSeO sample (0.11) .

Keywords

high energy milling; bicuseo; thermoelectric performance; microstructure; double doping

Subject

Chemistry and Materials Science, Materials Science and Technology

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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