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Gaël Bastien: Tunning the Kitaev magnet alpha-RuCl3 with hydrostatic pressure and chemical substitution
Begin: 20.03.2019, 14:10
Location: lecture room F2, first floor Ke Karlovu 5

Jerome Hurst: Magnetic moment generation in small gold nanoparticles via the plasmonic inverse Faraday effect
Begin: 21.03.2019, 13:00
Location: Thursday 21.3.2019 at 13:00, Ke Karlovu 5, Praha 2 in Seminar room F052

Itzhak Halevy: New Frontiers with Fission Track Analysis and TOF-SIMS Techniques
Begin: 21.03.2019, 14:00
Location: Lecture room F2, Facutly of Mathematics and Physics, First floor Ke Karlovu 5, Prague 2

Herwig Michor: Crystal growth and studies of CDW physics in quasi-1D metals RNiC2
Begin: 28.03.2019, 13:30
Location: lecture room F2, first floor Ke Karlovu 5

Jan Prokleška: Magnetism, magnetic phase transitions and magnetic phase diagrams
Begin: 22.05.2019, 14:10
Location: lecture room F2, first floor Ke Karlovu 5

 
Title: Anil Kumar: Polymorphism of thermoelectric TAGS-85
Number: 10/19
Status: Closing date exceeded
Begin: Wednesday, March 13, 2019 at 02:10PM
Tutor: Vladimír Sechovský
Location: lecture room F2, first floor Ke Karlovu 5


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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.