fig2

Figure 2. (A) XRD patterns of SNGM20 samples before and after washing; (B) Local enlargement of the XRD spectrum in (A); (C) High-angle annular dark field (HAADF) images and energy dispersive spectroscopy (EDS) mapping of SNGM20 powder after washing; SAED (D) and (E) HRTEM images of the SNGM20 powder after washing.