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Synchrotron Study of Ag-Doped Mg2Si: Correlation Between Properties and Structure

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Abstract

The crystal structure of Ag-doped Mg2Si was investigated using synchrotron and neutron powder diffraction analysis, including in situ synchrotron x-ray powder diffraction patterns, recorded during a thermal cycle from room temperature up to 600°C. Rietveld refinement of diffraction patterns indicated that Ag doping results in partial substitution at Si sites. During heating, the Mg2Si lattice parameters exhibited a shift in the temperature dependence at 300°C to 350°C, which was attributed to Ag precipitation out of Mg2Si1−x Ag x solid solution. In turn, an increase of the Ag present in the Mg2Si lattice after 350°C could be linked to thermally activated diffusion of Ag from β-AgMg phase. The Ag-dopant migration may explain previously outlined instabilities in the thermopower of Ag-doped Mg2Si, e.g., the drop of the Seebeck coefficient value after heating to 150°C to 200°C and its subsequent increase after 350°C to 450°C.

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Acknowledgements

The authors wish to acknowledge financial support from the ThermoMag Project, which is cofunded by the European Commission in the 7th Framework Program, the European Space Agency, and individual partner organizations. Also, the authors gratefully acknowledge Thomas Hansen (Institut Laue–Langevin, Grenoble, France) and Andrew Fitch (European Synchrotron Radiation Facility) for helpful discussions and experimental support.

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Authors and Affiliations

  1. European Space Agency, 1 Keplerlaan, 2201AZ, Noordwijk, The Netherlands

    Anastasiia Prytuliak

  2. Faculty of Materials Science and Ceramics, AGH University of Science and Technology, Al. A. Mickiewicza 30, 30-059, Kraków, Poland

    Elzbieta Godlewska & Krzysztof Mars

  3. Laboratoire CRISMAT, 6 Boulevard Juin, 14050, Caen Cedex 4, France

    David Berthebaud

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  1. Anastasiia Prytuliak
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  2. Elzbieta Godlewska
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  3. Krzysztof Mars
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  4. David Berthebaud
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Correspondence to Anastasiia Prytuliak.

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Prytuliak, A., Godlewska, E., Mars, K. et al. Synchrotron Study of Ag-Doped Mg2Si: Correlation Between Properties and Structure. J. Electron. Mater. 43, 3746–3752 (2014). https://doi.org/10.1007/s11664-014-3119-0

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  • DOI: https://doi.org/10.1007/s11664-014-3119-0

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