Pressure-induced charge transfer of Prussian blue analogues Cu0.64Mn0.86[Fe(CN)6]⋅nH2O

Abstract

The Prussian blue analogue Cu0.64Mn0.86[Fe(CN)6]⋅nH2O was synthesized by coprecipitation method and pressurized to 0 MPa, 1 MPa, 20 MPa, 30 MPa, 40 MPa, respectively. The effect of pressure on its properties was investigated by X-ray diffraction and Mössbauer spectroscopy. According to XRD results, the sample has a face-centered cubic (Fm-3m) structure. As the pressure increases, the lattice parameters become slightly smaller, but no new high-pressure phase is generated. The results of the Mössbauer spectrum show that as the pressure increases, the singlet of Cu0.64Mn0.86[Fe(CN)6]⋅nH2O increases, and the doublet decreases. Its indicate that the pressure-induced charge is transferred from CuII/MnII to FeIII and forms a mixed-valence ferricyanide system.