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Fig. 7


High-resolution transmission electron microscope images for different ball-milled carbon precursors of this study and different mill materials. They are shown at large mechanochemical milling times performed in an hydrogen atmosphere. A few images are shown after a few hours of ball milling for comparison. The colour-coding for the images is brown for stainless steel, green for tungsten carbide, and light cyan for zirconium oxide experiments, respectively.

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