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

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 in...

Full description

Saved in:
Bibliographic Details
Published in:Metals (Basel ) 2022-11, Vol.12 (11), p.1881
Main Authors: Jiang, Jia-Ling, Dong, Song-Tao, Fu, Zhuang, Yu, Miao-Cheng, Zhao, Lijun, Wang, Lei
Format: Article
Language:English
Subjects:
Ball milling
Bi2O2Se
Carrier density
Ceramics
Cold pressing
Conductivity
Doping
Electrical resistivity
Energy
Figure of merit
Grain boundaries
Heat conductivity
high-energy ball milling
Microstructure
Power factor
Raw materials
Scanning electron microscopy
Spectrum analysis
Ta doping
Tantalum
Thermal conductivity
Thermodynamic properties
thermoelectric properties
Thermoelectricity
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:2075-4701
2075-4701
DOI:10.3390/met12111881