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Enhancing thermoelectric properties of Ca3Co4O9 ceramics through oscillatory pressure sintering

Authors :
Xiao Li
Jiajia Wu
Sijie Huang
Yan Gao
Dianguang Liu
Jinling Liu
Hua-Tay Lin
Source :
Journal of Materials Research and Technology, Vol 28, Iss , Pp 3475-3484 (2024)
Publication Year :
2024
Publisher :
Elsevier, 2024.

Abstract

Oscillatory Pressure Sintering (OPS) has been demonstrated to be a favorable manufacturing approach for the control of fine and uniform distribution of grains in various ceramic systems, which can lead to enhanced densification and thus improved physical and mechanical properties. In this study, OPS was utilized to prepare pure Ca3Co4O9 thermoelectric material. The results show that the electrical properties and thermoelectric properties of Ca3Co4O9 prepared by OPS are superior to those of samples sintered by conventional hot pressing (HP) without oscillation. This may be attributed to the better alignment of plate-like grains in the OPS samples, which increase electrical conductivity, and also the higher density of grain boundaries that enhance the phonon scattering and, thus, the reduction of thermal conductivity. This study suggests that a straightforward oscillatory pressure sintering approach can be utilized to obtain high-quality and high-performance thermoelectric materials without the need for doping, templating, or high-temperature sintering.

Details

Language :
English
ISSN :
22387854
Volume :
28
Issue :
3475-3484
Database :
Directory of Open Access Journals
Journal :
Journal of Materials Research and Technology
Publication Type :
Academic Journal
Accession number :
edsdoj.9065b548a69dd91fd25aa9aff8
Document Type :
article
Full Text :
https://doi.org/10.1016/j.jmrt.2023.12.256