Synthesis and Characterization of Ag‐Delafossites Ag B O 2 ( B : Al, Ga, In) from a Rapid Hydrothermal Process

Invited for the cover of this issue are Dr. Elias Frei and co‐workers from the Inorganic Chemistry Department of the Fritz‐Haber‐Institute of the Max‐Planck‐Gesellschaft, Berlin, and Dr. Frank Rosowski from BasCat/BASF, Ludwigshafen, Germany. The cover image shows three different hourglasses underlining the importance of the reaction time for the hydrothermal preparation of the metastable delafossites Ag B O 2 ( B : Al, Ga, In).