Figure 1. HAADF STEM images taken from the needle sample.

(a) HAADF image showing the structure of LMRTMO needles. (b) Colour-coded HAADF image showing the variants of the monoclinic phase. (c) HAADF image with a larger field of view showing that domains of a single-phase, monoclinic structure are present throughout the primary particle. (d–f) Model showing the monoclinic structure in [110], [10] and [110] directions, respectively. (g) HAADF image showing that the structure is observed over the entire primary particle. Occasionally, transition metal-rich defects are observed as shown in the inset, which corresponds to the defect shown in the red oval.