Cover Picture: Discovery of Elusive K4O6, a Compound Stabilized by Configurational Entropy of Polarons (Angew. Chem. Int. Ed. 1/2019). Issue 1 (12th December 2018)

• Record Type: Journal Article
• Authors: Freysoldt, Christoph; Merz, Patrick; Schmidt, Marcus; Mohitkar, Shrikant; Felser, Claudia; Neugebauer, Jörg; Jansen, Martin
• Is Part Of: Angewandte Chemie international edition. Volume 58:Issue 1(2018)
• Page Start: 1
• Page End: 1
• Publication Date: 2018-12-12
• Subjects: density functional theory -- entropy -- mixed valent compounds -- solid-state reactions; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201813481
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract : Discovery of elusive K 4 O 6 an endothermic mixed peroxide–superoxide compound: In the Communication onpage 149, M. Jansen et al. report on the synthesis of K4 O6 that owes its stability to the configurational entropy of polarons, and thus exists only above a distinct temperature threshold. The puzzling speed at which the all‐solid‐state reactions of formation and decomposition proceed, as a function of temperature, are illustratively documented by areal‐time video .