Effect of antimony-doping and germanium on the highly efficient thermoelectric Si-rich-Mg2(Si,Sn,Ge) materials
Polymeris, G. S.
Khan, A. U.
Lioutas, C. B.
Stefanaki, E. C.
Paraskevopoulos, K. M.
SourceJournal of Alloys and Compounds
Google Scholar check
MetadataShow full item record
Two series of materials (a) Mg2Si0.55-ySn0.4Ge0.05Sby, 0 ≤ y ≤ 0.0175 and (b) Mg2Si0.5875-xSn0.4GexSb0.0125, 0 ≤ x ≤ 0.20 have been developed and studied in terms of structural features and thermoelectric properties/performance. The materials were prepared by a combination of low temperature reaction, ball milling process and hot pressing consolidation. Structure and composition across all relevant length scales was monitored by using XRD, SEM, TEM and HRTEM analysis and the influence of Sb-doping and Ge-addition on the phase structure and thermoelectric transport properties is presented. All different existing phases (Si-rich, Sn-rich and Ge-rich regions) contribute to the overall thermoelectric performance, having varying compositions in terms of the Bi dopant. Moreover, the coexistence of microstructural constituents and nanostructures formed in these materials is discussed explaining the enhancement of the TE behavior via the decrease of thermal conductivity. © 2017
Showing items related by title, author, creator and subject.
On the use of thermoelectric (TE) applications based on commercial modules: The case of TE generator and TE cooler Zorbas, K.; Hatzikraniotis, E.; Paraskevopoulos, K. M.; Kyratsi, Theodora (Department of Physics, Aristotle University of Thessaloniki, GreeceDepartment of Mechanical and Manufacturing Engineering, University of Cyprus, Nicosia, CyprusCorrespondence Address: Zorbas, K.Department of Physics, Aristotle University of ThessalonikiGreece, 2010)In recent years, thermoelectricity sees rapidly increasing usages in applications like portable refrigerators, beverage coolers, electronic component coolers etc. when used as Thermoelectric Cooler (TEC), and Thermoelectric ...
Ioannou, M.; Polymeris, G. S.; Hatzikraniotis, E.; Paraskevopoulos, K. M.; Kyratsi, Theodora (2014)In this work, Bi-doped magnesium silicide compounds were prepared by applying a combination of both, short-time ball milling and heating treatment. The effect of Mg excess was also studied, aiming towards further improvement ...
Lioutas, C. B.; Hatzikraniotis, E.; Ioannou, M.; Paraskevopoulos, K. M.; Kyratsi, Theodora (2011)In this work, K2Bi8Se13 material was ball-milled in order to develop nanostructures through the modification of structural features. Structural changes during ball-milling were followed by powder X-ray diffraction measurements, ...