Figure 4

(a) HAADF-STEM image of the FIB-TEM specimen OTZ3-2 associated with the elemental maps. (b) A magnified HAADF-STEM image of the high Cs phase indicated by the arrow in (a). (c) A representative EDX spectrum of the high Cs phase indicated by the arrow in (a). (d) HRTEM image of the high Cs phase indicated by the arrow in (a). (e) The SAED pattern of the high Cs phase from two different major zone axes.