K-Ion Slides in Prussian Blue Analogues.

ABSTRACT: We study the phenomenology of cooperative off-centering of K⁺ ions in potassiated Prussian blue analogues (PBAs). The principal distortion mechanism by which this off-centering occurs is termed a "K-ion slide", and its origin is shown to lie in the interaction between local electrostatic dipoles that couple through a combination of electrostatics and elastic strain. Using synchrotron powder X-ray diffraction measurements, we determine the crystal structures of a range of low-vacancy K₂M[Fe(CN)₆] PBAs (M = Ni, Co, Fe, Mn, Cd) and establish an empirical link between composition, temperature, and slide-distortion magnitude. Our results reflect the common underlying physics responsible for K-ion slides and their evolution with temperature and composition. Monte

SUBMITTER: Cattermull J 

PROVIDER: S-EPMC10636749 | biostudies-literature | 2023 Nov

REPOSITORIES: biostudies-literature