Naslov
Thermoelectric properties of Ba8Au5.25Ge40.3□0.45 under hydrostatic pressure

Autori
Popčević, Petar

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, neobjavljeni rad, znanstveni

Izvornik
C-MAC days 2013 / - , 2013

Skup
C-MAC days 2013

Mjesto i datum
Ljubljana, Slovenija, 09.12.2013. - 12.12.2013

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
clathrates; transport properties

Sažetak
Due to their relatively large figure of merit, as well as chemical and thermal stability at high temperatures, clathrates are very promising thermoelectric materials. Among clathrate type-I systems, Ba8GaxGe46-x was reported to have the highest ZT value reaching 1.35 for n-type (x=16) and 1.1 for p-type (x=18) crystals. Thus Ba-containing clathrates are considered to be prospective thermoelectrics. In the current spot of interest are ternary type-I clathrates in Ba-Au-Ge and Ba-Ag-Ge systems. The main research activity was focused mainly on solubility of Au, phase equilibria and some transport properties.[1-4] It seems that depending on Au (Ag) content dominant electrical carriers can be of p or n type, while the temperature dependence reveals either metallic or semiconducting behaviour. Hydrostatic pressure is a powerful tool for probing electronic structure of material. Through changing interatomic distances it directly influences band structure increasing overlapping integrals and electronic velocities.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

Napomena
This work was done within the activities of the European Integrated Center for the Development of New Metallic Alloys and Compounds - C-MAC.

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