Mechanical Alloying: An Advantageous Method for the Development of Mg₂Si_0.8Sn_0.2 and Mg₂Si Thermoelectrics Using Commercial and Recyclable Silicon.

ABSTRACT: A comparative study of Bi-doped Si-rich silicide phases, Mg₂Si_0.8Sn_0.2 and Mg₂Si, is reported, investigating in parallel two different synthetic routes: the solid-state reaction (SSR) and mechanical alloying (MA). Both synthetic routes produce the desired silicide phases. However, powder XRD Rietveld refinements reveal appreciable Mg and Sn losses for the SSR-developed Mg₂Si_0.8Sn₂, while EDS measurements also confirm Sn losses together with a decrease in the Bi content. This has a strong impact in electrical transport properties, indicating a severe electron doping deficiency. In contrast, the EDS results for MA-based phases are in a good agreement with the nominal values, indicating an effective Bi doping. Moreov

SUBMITTER: Mangelis P 

PROVIDER: S-EPMC11815622 | biostudies-literature | 2025 Feb

REPOSITORIES: biostudies-literature