Effects of Ga content on thermoelectric properties of P-type Ba8Ga16+xZn3Ge27−x type-I clathrates

Autor:	Xinfeng Tang, Pei-zhi Yang, Ming Li, Shu-kang Deng
Rok vydání:	2009
Předmět:	Lattice thermal conductivity Electron mobility Materials science Thermal conductivity Mechanics of Materials Electrical resistivity and conductivity Mechanical Engineering Seebeck coefficient Thermoelectric effect Analytical chemistry Spark plasma sintering General Materials Science Nanotechnology
Zdroj:	Journal of Materials Science. 44:939-944
ISSN:	1573-4803 0022-2461
Popis:	P-type Ba8Ga16+xZn3Ge27−x (x = 0.1, 0.2, 0.3, and 0.4) type-I clathrates were synthesized by combining solid-state reaction with spark plasma sintering (SPS) technology. The effects of slight increase of Ga content on thermoelectric properties have been investigated. The results show that at room temperature the carrier concentration Np of p-type Ba8Ga16+xZn3Ge27−x clathrates increases remarkably compared with that of Ba8Ga16Zn3Ge27 compound, which results in the increases of electrical conductivity although carrier mobility μH slightly decreases. The thermal conductivity κ of all samples increases with the increase of Ga content. Ba8Ga16.2Zn3Ge26.8 compound exhibits the highest ZT value of 0.43 at 700 K, which is increased by 13% compared with that of Ba8Ga16Zn3Ge27 compound.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::b03e9f0011a50d8b88c2be3a779fa9c4 https://doi.org/10.1007/s10853-008-3205-x Zobrazit plný text záznamu Plný text ve formátu PDF