Fig. 2

Dissolution of an octahedron-shaped magnetite observed ex situ after reaction in 0.1 M HCl solution up to 14 min. a, b were the 3D volume viewed from two different perspectives at a 30% amplitude threshold. The displacement field along the [311] direction were projected on the isosurfaces. c 3D strain associated with compressive (blue, strain < −0.00035 shown in Fig. 3d) and tensile (red, strain > 0.00035 shown in Fig. 3d) strains. d Cross-sectional views of the internal strain field at the dashed line box in a and b. Scale bar, 200 nm