Front Cover: Niobium, Tantalum, and Tungsten Doped Tin Dioxides as Potential Support Materials for Fuel Cell Catalyst Applications (Z. Anorg. Allg. Chem. 18/2020)

Abstract

The cover picture shows a hypothetical clustering of three Sn2+ ions (Sn''Sn) with stereochemically active lone pairs around an O2– vacancy (VO∙∙) in the tetragonal rutile‐type structure of SnO2 with octahedral coordination of the tin ions. Each O2– ion is trigonal planar coordinated by three Sn2+/4+ ions as well as 11 O2– in the tetragonal close packing of the rutile structure‐type. Internal redox reactions between Ta5+/Ta4+ and Sn4+/Sn2+ and possibilities to reduce the electrostatic repulsion between cations on introduction of anion vacancies into the crystal structure are also indicated. More details can be found in the Article by Klaus Stöwe, and Maximilian Weber on page 1470 ff.