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SEM images and the corresponding composition mappings by EDS taken from the polished surface (with and without HNO3‐etching) of Mg3.05SbBi0.97Te0.03 pellets hot pressed using a) big pieces, and hand‐ground powders b) in argon‐filled glovebox and c) in air, showing an increase in oxidation but a decrease in average grain size from (a) to (c).
