MGML

Materials Growth & Measurement Laboratory

Anil Kumar: Polymorphism of thermoelectric TAGS-85

Seminar on Magnetism
Date: Wednesday, 13 March 2019 14:10 - 15:10


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We have a pleasure to invite you to attend the joint seminar
of the Department of Condensed Matter Physics (DCMP)
and the Materials Growth and Measurement Laboratory (MGML) http://mgml.eu.

 

Program

 

Anil Kumar: Polymorphism of thermoelectric TAGS-85

lecture given by:

Anil Kumar

Zernike Institute for Advanced Materials, University of Groningen

The seminar takes place in the lecture room F2 
of the Faculty of Mathematics and Physics, Ke Karlovu 5, Praha 2
on Wednesday, 13.3. 2019 from 14:10 

Vladimír Sechovský
On behalf of the DCMP and MGML


Abstract 

The alloys (GeTe)X(AgSbTe2)1-X (commonly known as TAGS) are among the best high-temperature thermoelectric materials, largely due to their low thermal conductivity. Here we focus on TAGS-85, which is reported to have a transition from a rhombohedral phase to a cubic phase above ~200 °C. We have found a way to stabilize both of these polymorphs at room temperature by careful adjustment of the synthesis conditions. We study the structural properties of both rhombohedral and cubic TAGS-85 as a function of thermal cycling and reveal a much more complex behavior than previously reported, involving transformations to novel layered structures. The thermoelectric properties of both polymorphs will be discussed with respect to their electrical conductivity, Seebeck coefficient and thermal conductivity.

 

Address
Ke Karlovu 2026/5, 120 00 Praha, Czech Republic

 

Map


 

All Dates


  • Wednesday, 13 March 2019 14:10 - 15:10