Pressure-Induced Changes in Prussian Blue Analogues Na0.54Co1.23[Fe(CN)6]•7.6H2O

The effects of pressure on the microstructure and magnetic properties of Co-Fe bistable Prussian blue analogues (PBA) were investigated by Mossbauer spectroscopy and magnetic measurements. Na0.54Co1.23[Fe(CN)(6)]center dot 7.6H(2)O was prepared by the co-precipitation method and pressurized at 1-40 MPa using a supercritical CO2 extraction unit. All materials are face-centered cubic with a Neel temperature of about 14 K. The results showed that two electronic configurations existed in the NaCoFe-PBA system at room temperature: Fe-LS(III)-CN-Co-HS(II) and Fe-LS(II)-CN-Co-LS(III). The pressure induced the enhancement of antiferromagnetic coupling between Co-Fe ions and controlled the interconversion of the two structures through charge transfer mediated by cyanide bridges. We found that the directions of redox reactions occurring at 0-20 MPa and 20-40 MPa did not coincide, suggesting that there may be more complex interactions between structural and electronic events.

Automated summary

The effects of pressure on the microstructure and magnetic properties of Co-Fe bistable Prussian blue analogues were investigated. The results showed that pressure can control the interconversion of two structures through charge transfer mediated by cyanide bridges. These findings provide important clues for further understanding the microstructure and magnetic behavior of the material.