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Cover Picture: Discovery of Elusive K 4 O 6 , a Compound Stabilized by Configurational Entropy of Polarons (Angew. Chem. Int. Ed. 1/2019)
Author(s) -
Freysoldt Christoph,
Merz Patrick,
Schmidt Marcus,
Mohitkar Shrikant,
Felser Claudia,
Neugebauer Jörg,
Jansen Martin
Publication year - 2019
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Reports
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201813481
Subject(s) - polaron , configuration entropy , endothermic process , cover (algebra) , solid state , entropy (arrow of time) , chemistry , thermodynamics , materials science , chemical physics , crystallography , physics , electron , quantum mechanics , mechanical engineering , engineering , adsorption
Discovery of elusive K 4 O 6 an endothermic mixed peroxide–superoxide compound: In the Communication on page 149, M. Jansen et al. report on the synthesis of K 4 O 6 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 a real‐time video.