Fig. 4
From: Investigation of Cd(II) sorption by mackinawite (FeS) under anoxic conditions
High-angle annular dark-field scanning transmission electron microscopy (HAADF-TEM) image (a), high resolution-transmission electron microscopy (HR-TEM) image (b), and selected area electron diffraction (SAED) pattern (c). The sample was obtained from 0.015 M Cd(II)-added 2 g/L FeS batch at pH 4.6. Part b is an enlarged image of the boxed area in part a. In part b, orange arrows indicate the lattice fringe patterns of hawleyite, and the yellow arrow indicates those of mackinawite. In part c, the reflection rings are indexed for hawleyite