Enhanced dimensionless figure-of-merit of Ca3Co4O9 by nano-sized precursor

Ca3Co4O9 sample synthesized from nanometer of CaCO3 and Co2O3 sized precursor has been prepared by solid-state reaction and fast sintering by hot press method. The fast-sintering time can maintain the particle size of the nanometer. Their thermoelectric properties at high temperatures have been stud...

Full description

Saved in:
Bibliographic Details
Published in:Japanese Journal of Applied Physics 2022-03, Vol.61 (3), p.035501
Main Authors: Namhongsa, Wanatchaporn, Seetawan, Tosawat
Format: Article
Language:English
Subjects:
Calcium carbonate
calcium cobalt oxide
ceramic thermoelectric
Cobalt oxides
High temperature
low thermal conductivity
powder precursor size
Power factor
Precursors
Sintering (powder metallurgy)
Synthesis
Thermal conductivity
thermoelectric properties
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Ca3Co4O9 sample synthesized from nanometer of CaCO3 and Co2O3 sized precursor has been prepared by solid-state reaction and fast sintering by hot press method. The fast-sintering time can maintain the particle size of the nanometer. Their thermoelectric properties at high temperatures have been studied at 300–1000 K. The usage of a nano-sized precursor leads to decreased electrical resistivity, increased power factor, and would lead to huge dimensionless figure-of-merit (ZT) growth, respectively. The main effect is observed on thermal conductivity that is lower than the sample synthesized with micrometer precursors powder from 0.67 W mK−1 which became 0.36 W mK−1 at 973 K. The best ZT value of Ca3Co4O9 reaches 0.51 at 973 K.
ISSN:0021-4922
1347-4065
DOI:10.35848/1347-4065/ac43cf