Next Article in Journal
Standing Wave Field Distribution in Graded-Index Antireflection Coatings
Previous Article in Journal
Bloch Surface Wave Photonic Device Fabricated by Femtosecond Laser Polymerisation Technique
Previous Article in Special Issue
Synthesis and Thermoelectric Properties of TiO2/Cu2SnSe3 Composites
Article

Thermal Stability and Tuning of Thermoelectric Properties of Ag1−xSb1+xTe2+x (0 ≤ x ≤ 0.4) Alloys

1
Institut für Experimentelle Physik, TU Bergakademie Freiberg, Leipziger Str. 23, 09599 Freiberg, Germany
2
Thermoelectric Research Laboratory, Faculty of Materials Science and Ceramics, AGH University of Science and Technology, A. Mickiewicza Av. 30, 30-059 Krakow, Poland
3
Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Str. 40, 01187 Dresden, Germany
*
Authors to whom correspondence should be addressed.
Appl. Sci. 2018, 8(1), 52; https://doi.org/10.3390/app8010052
Received: 14 November 2017 / Revised: 16 December 2017 / Accepted: 25 December 2017 / Published: 4 January 2018
(This article belongs to the Special Issue Recent Progress in the Development of Thermoelectric Materials)
Introduction of nonstoichiometry to AgSbTe2-based materials is considered to be an effective way to tune thermoelectric properties similarly to extrinsic doping. To prove this postulate, a systematic physicochemical study of the Ag1−xSb1+xTe2+x alloys (0 ≤ x ≤ 0.4) was performed. In order to investigate the influence of the cooling rate after synthesis on phase composition and thermoelectric performance, slowly cooled and quenched Ag1−xSb1+xTe2+x alloys (x = 0; 0.1; 0.17; 0.19; 0.3; 0.4) were prepared. Single-phase material composed of the β phase (NaCl structure type) was obtained for the quenched x = 0.19 sample only. The other alloys must be regarded as multi-phase materials. The cooling rate affects the formation of the phases in the Ag-Sb-Te system and influences mainly electronic properties, carrier mobility and carrier concentration. The extremely low lattice thermal conductivity is an effect of the mosaic nanostructure. The maximal value of the figure of merit ZTmax = 1.2 is observed at 610 K for the slowly cooled multi-phase sample Ag0.9Sb1.1Te2.1. Thermoelectric properties are repeatedly reproducible up to 490 K. View Full-Text
Keywords: thermoelectric properties; Ag1−xSb1+xTe2+x; thermodynamic stability; nanostructure thermoelectric properties; Ag1−xSb1+xTe2+x; thermodynamic stability; nanostructure
Show Figures

Figure 1

MDPI and ACS Style

Wyżga, P.; Veremchuk, I.; Burkhardt, U.; Simon, P.; Grin, Y.; Wojciechowski, K.T. Thermal Stability and Tuning of Thermoelectric Properties of Ag1−xSb1+xTe2+x (0 ≤ x ≤ 0.4) Alloys. Appl. Sci. 2018, 8, 52. https://doi.org/10.3390/app8010052

AMA Style

Wyżga P, Veremchuk I, Burkhardt U, Simon P, Grin Y, Wojciechowski KT. Thermal Stability and Tuning of Thermoelectric Properties of Ag1−xSb1+xTe2+x (0 ≤ x ≤ 0.4) Alloys. Applied Sciences. 2018; 8(1):52. https://doi.org/10.3390/app8010052

Chicago/Turabian Style

Wyżga, Paweł, Igor Veremchuk, Ulrich Burkhardt, Paul Simon, Yuri Grin, and Krzysztof T. Wojciechowski 2018. "Thermal Stability and Tuning of Thermoelectric Properties of Ag1−xSb1+xTe2+x (0 ≤ x ≤ 0.4) Alloys" Applied Sciences 8, no. 1: 52. https://doi.org/10.3390/app8010052

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop