Abstract
Thermoelectric materials (GeTe)100−x(AgSbTe2)x, or TAGS, are known materials for middle-temperature range applications, because of their very good electrical and thermal properties. A GeTe-based TAGS material exhibits high thermal and electrical conductivity but its Seebeck coefficient is too low and can be optimized by optimal doping. One of the methods to decrease thermal conductivity is nano-structurization by introducing nano AgSbTe2 inclusions into the matrix, however, that will also interfere with other thermoelectric properties. The influence of AgSbSe2 addition on thermoelectric properties was analysed. For the purpose of this work AgSbSe2, AgSbTe2, GeTe and compositions (GeTe)75(AgSbTe2)y(AgSbSe2)x was synthesised, where x + y = 25 and y = (0, 0.26; 0.51, 1.25, 6.25). This paper describes the preparation and thermoelectric properties of materials, consolidated by rapid Spark Plasma Sintering (SPS). For optimally doped TAGS-75 with the addition of AgSbSe2 (y = 1.25), the stabilization of the cubic structure was obtained, an increase of Seebeck coefficient by about 50% (from 50 to 100 μVK−1 at 325 K), thermal conductivity decrease by 20% (from 1.2 to 0.95 Wm−1K−1 at 325 K), electrical conductivity decrease by about 50% (1.8 ×105 to 9 ×104 Sm−1). Finally, the thermoelectric figure dimensionless of merit ZT increased by about 40% (323–625 K) and its maximum value reached ZT= 1.2 (at 625 K) for optimally doped material, while 0.7 at 625 K for undoped TAGS-75.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.