Figure 3.
HRTEM images of a (a) CFO and a (b) CFO210 NPs with FFT analysis (c,d) obtained from the NP in (a) and (b), respectively. The labeled spots are related to crystallographic planes that can be indexed as cubic spinel structure (Fd3̅m), in zone axis [110]. Strain maps εxy (symmetric shear) obtained by GPA analysis of the NPs (e) before and (f) after thermal annealing. The maps are calculated from (e,f) g1 = (1-1-1) and g2 = (1-11) reflections respectively, and plotted in the relative interval (−0.3, +0.3). Lattice deformation percentage profiles of (g) CFO and (h) CFO210 measured along the diagonal of the NP (dotted white line), which allowed to estimate the relative displacement of the (111) planes with respect to the reference region (see the SI for further details).