Year: 2021
Type: article
Abstract: Ca 3 Co 4 O 9 sample synthesized from nanometer of CaCO 3 and Co 2 O 3 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 ( Z T ) 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 Z T value of Ca 3 Co 4 O 9 reaches 0.51 at 973 K.
Authors: Wanatchaporn Namhongsa, Tosawat Seetawan
Institution: Sakon Nakhon Rajabhat University
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: bronze
Award: G2234251488
OpenAlex ID: W4200162356