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

Autor:	Wanatchaporn Namhongsa, Tosawat Seetawan
Rok vydání:	2022
Předmět:	Physics and Astronomy (miscellaneous) General Engineering General Physics and Astronomy
Zdroj:	Japanese Journal of Applied Physics. 61:035501
ISSN:	1347-4065 0021-4922
DOI:	10.35848/1347-4065/ac43cf
Popis:	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 ( 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 Ca3Co4O9 reaches 0.51 at 973 K.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::017cbbdf5bbabdf0a005cf9c17aa7ee1 https://doi.org/10.35848/1347-4065/ac43cf Zobrazit plný text záznamu