The article from this special issue was previously published in NMR In Biomedicine , Volume 35, Issue 9, 2022. For completeness we are including the title page of the article below. The full text of the article can be read in Issue 35:9 on Wiley Online Library: https://doi.org/10.1002/nbm.4757

Variable temperature 133Cs‐NMR experiments were performed to probe the local environment of the cesium ions in hydrated cesium cobaltates (Cs0.2CoO2·0.63H2O) from 170 to 390 K. Temperature dependence of the chemical shifts and linewidths reveals two‐phase transitions at a temperature near 200 and 350 K. Three inequivalent cesium sites are observed as the temperature is reduced below 200 K, indicating restricted motion of the cesium ions and a tendency to electron localization on cobalt ions. The results provide evidence for a definite order of the cesium ions and the charge order of the cobalt ions in the CoO2 layers. Two inequivalent cesium sites with larger chemical shift differences are observed as the temperature is above 350 K, indicating a spectacular change in the space between the CoO2 planes, which provides evidence for the transition between the bilayer‐hydrated and monolayer‐hydrated structures.