Fig. 2: The role of configurational entropy in phases.
From: Electronegativity and entropy design of layered oxides for sodium-ion batteries
a Schematic illustrations of d(O-Na-O) / d(O-TM-O) with TM species increase. b XRD patterns of the layered oxide series with an increasing number (N) of transition metal species. N represents the total number of different TM cations in the composition. Standard reference patterns for P2 and O3 phases are included. (P2: ICDD No. 01-070-3726, O3: ICDD No. 01-073-2048). c The change of O/P phase structure with entropy values. d The O 2p comparative PDOS of mono-TM and multi-TM (N = 6) systems. e XRD patterns of a composition series where individual components are removed from the 6 compositions. f The change of O/P phase structure with entropy values. g Relationship between \({W}_{{{{\rm{\chi }}}}}\) value and \({\triangle \chi }_{{{{\rm{TM}}}}}\) of synthetic materials.
