Comparing Doping Methodologies in Mg2Si/AgMg System
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Morphological and optical characterizations for the Mg2Si samples doped with Ag are presented. Two different doping methodologies with silver, namely in situ and ex situ doping, were studied for the case of Mg2Si of self-propagating high-temperature synthesis. Electron microscopy measurements in both scanning and transmission configurations verified the presence of AgMg precipitates embedded in the Mg2Si matrix and similar results were also yielded by FTIR spectroscopy. Finally, the dependence of silver content in both forms of dopant and inter-metallic constituent is studied upon doping technology.
KeywordsThermoelectric materials magnesium silicide silver SEM TEM FTIR
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The financial support from the ThermoMag Project, which is co-funded by the European Commission in the 7th Framework Programme (contract NMP4-SL-2011-263207), by the European Space Agency and by the individual partner organizations, is acknowledged (contract no. 6099/B/T02/2010/38N, funded by National Science Centre in Poland). Moreover, the authors are grateful to Dr. Georgios Vourlias from Aristotle University of Thessaloniki, Physics Department for performing additional XRD measurements.