Cover Feature: Microstructural evolution of layered K‐doped RuCl3 during annealing traced by thermogravimetric analysis and 3D electron diffraction

The cover picture shows an artistic representation of a nanoscale phase separation which can be naturally induced by rapid, out‐of‐equilibrium heating of K‐doped RuCl3. Combining the pXRD, TGA‐MS, HRTEM and 3D electron diffraction we step‐by‐step trace the phase conversion and unveil the crystal structure of a distinct K3Ru2Cl9 domain arising from the decomposition process, embedded into the KxRu2Cl6 matrix. Natural annealing can be beneficial for the formation of 2D architectures and serve as an alternative to the time‐ and energy‐consuming artificial growth methods (DOI: 10.1002/zaac.202300141).