Effect of sintering temperature on formation and thermoelectric properties of La0.4Ni0.4Co3.6Sb12skutterudite by mechanical alloying and hot pressing
Year: 2005
Type: article
Abstract: In this work, La 0.4 Ni 0.4 Co 3.6 Sb 12 filled skutterudite was prepared successfully by mechanical alloying (MA) and subsequent hot pressing. With increasing hot press (HP) temperature, the content of the filled skutterudite phase increases and its composition tends to the nominal composition; a single phase filled skutterudite compound can be obtained when the HP temperature is higher than 550 °C. The Seebeck coefficient and electrical resistivity of the hot pressed sample increased while its thermal conductivity decreased and the resultant figure of merit increased with the increase in the HP temperature. A fractograph observation shows that there are two nanocrystalline microstructures in the hot pressed filled skutterudite sample—one is the prime skutterudite phase formed by MA with a relatively large size, about 300 nm, and the other is the skutterudite produced during the HP process which has an average grain size about 80 nm.
Institution: Huazhong University of Science and Technology
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W1995503336