We have recently shown that it is possible to image ferroelastic domains inside nanowires of the metal halide perovskite CsPbBr3 [Marcal 2020]. A presentation by Lucas Marcal on these results can be found here. Similar methods can be used to image ferrolastic domains induced by AFM [Marcal 2021]. Recently, we demonstrated 3D imaging of ferroelastic domains in CsPbBr3 nanoparticles [Dzhigaev 2021]. A presentation about these results can be found here. Dmitry Dzhigaev has also made a longer presentation about the method, Bragg Coherent Diffraction Imaging, found here.