Reaction and diffusion phenomena in Ag-doped Mg2Si

The Ag-doped Mg2Si–based materials are known for unstable thermoelectric behavior; however, the reasons are not sufficiently understood. In this work a range of experiments, analytical tools and calculations was used to unravel some questions related to the reactivity and diffusion properties of the...

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Bibliographic Details
Published inJournal of alloys and compounds Vol. 657; pp. 755 - 764
Main Authors Godlewska, Elzbieta M., Mars, Krzysztof, Drozdz, Pawel, Tchorz, Adam, Ksiazek, Marianna
Format Journal Article
LanguageEnglish
Published Elsevier B.V 05.02.2016
Subjects
Ag-doped Mg2Si
Diffusion
Microstructure
Powder metallurgy
Thermochemistry
Thermochemistry
Powder metallurgy
Diffusion
Microstructure
Ag-doped Mg2Si
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Summary:The Ag-doped Mg2Si–based materials are known for unstable thermoelectric behavior; however, the reasons are not sufficiently understood. In this work a range of experiments, analytical tools and calculations was used to unravel some questions related to the reactivity and diffusion properties of the Ag–Mg–Si system, which might contribute to the variations of thermopower. Among these, the most informative appeared quenching and diffusion experiments, calculations of phase evolution by Fact Sage and x-ray tomography of Ag-doped materials produced from powders. [Display omitted] •Ag-doped Mg2Si was produced by combustion synthesis followed by hot pressing.•In-situ and ex-situ doped material contained AgMg intermetallic.•Exclusively grain boundary regions were enriched in silver.•Positive thermopower was repeatedly recorded over 300 °C.•Below 300 °C, thermopower was dependent on thermal history of material.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2015.10.174