The effect of dehydration conditions on structure stability of PBAs

Prussian Blue Analogues of the type M3[Co(CN)6]2 is a family of cyanide materials that are extensively studied for hydrogen storage applications. Our preliminary studies show that the last step of sample preparation, namely drying, has a profound effect on the structure. It not only removes the water, but also changes the arrangement of vacancies. For instance, samples dried at 100o C, 150o C and 200o C have drastically different local structure, but the same average structure. In this work we will collect single crystal diffuse scattering datasets to systematically study structural variations of Prussian Blue analogues under various drying conditions: in vacuum, under stream of dry nitrogen, by heating on air at different T, by solvent replacement.