Defects, fine and hyperfine interactions of the historical Prussian Blue compound Giese-salt : Ammonium-Ferric-Hexacyano-Ferrate

Prussian Blue compounds (PBC) have shown a huge potantial of applications in physics, chemistry, medicine and radioecology, e.g., selected PBC are acting as efficient ionexchanger extracting the radioistope 137Cs in solutions. In this study, the focus is the PBC ammonium iron(III) hexacyanoferrate(II) (NH4{Fe(III)[Fe(II)(CN)6]}), also known as Giese-salt, which is the ammonium derivative of the classic ("soluble") Prussian Blue as applied in veterinary medicine. Here, we
investigate the Giese salt by a variety of techniques (XRD, ATR-IR, REM,...) highlighting the results of our Raman, XAFS and 57Fe-Mössbauer study confirming a local  distribution of hyperfine parametersas expected for a disordered system.