EELS characterization of Ti-rich regions in SSW rims. (a) HAADF image of the 2 hr sample. (b) Fe/Ti ratio map (see Section 2) of the 2 hr sample in the same region as (a). (c) EELS low-loss spectra of the Ti-rich regions (blue) in (b) along with spectra from unexposed ilmenite (black). Dashed line marks the 10.5 eV peak, which arises from the formation of a TiO₂ phase. (d) Ti L-edge spectra of the Ti-rich regions (blue) alongside an unexposed ilmenite spectrum (black). (e)–(h) Same as (a)–(d), but for the 12 hr sample. (i)–(l) Same as (a)–(d), but for the 14 hr sample.