Fig. 2: In situ TEM observation of diamond nanoparticles (DNPs) being engulfed into iron.
From: Inward motion of diamond nanoparticles inside an iron crystal
a A typical example showing the engulfed process of a DNP aggregate on the lateral surface of pure iron. The oxide scale on surface of iron is highlighted in green. The blue curves with arrows represent the Fe flux. b STEM image of another DNP aggregate before it was fully engulfed into iron. c EELS spectra acquired from the square box “c” in (b). The C K-edge corresponds to the second K-shell ionization loss peak of crystalline diamond at 299 eV, and the characteristic Fe L2 and Fe L3 edges prove the existence of Fe. d High-resolution STEM image taken from the “d” box in (b). Note the graphite layer on the outer surface.
