Fig. 5: Pore expansion and anisotropic etching.
From: Direct observation of cation diffusion driven surface reconstruction at van der Waals gaps
a–l ADF-STEM images acquired at different times showing the evolution of the pores viewed along the [\(\bar{2}11\)0] zone axis at 400 °C. Black, pink and orange solid lines indicate the newly formed (0001), (01\(\bar{1}\bar{7}\)) and (01\(\bar{1}\)4) surfaces, respectively. The scale bar is 20 nm. m Atomic model of a typical pore terminated with three different surfaces (top left). Total projected length of the different surfaces as a function of time (top right). Schematic representation of the typical pore evolution stages (bottom). n Average in-plane and out-of-plane distances of the pores as a function of time. o Surface energy of the different surfaces in bulk Bi2Te3 and GBT. Source data are provided as a Source Data file.
