A coexistence of ferromagnetic and antiferromagnetic exchange interactions in prussian blue analog Cu0.47Ni0.48Mn0.55[Fe(CN)6]·XH2O

Multi-metal prussian blue analogs may include both ferromagnetic and antiferromagnetic exchange interactions between different metal ions and exhibit the novel magnetism. We obtained a mixed ferri-ferromagnetic prussian blue analog Cu0.47Ni0.48Mn0.55[Fe(CN)6]·XH2O by chemical coprecipitation method. The compound has a typical face-centered cubic lattice and shows novel mixed ferri-ferromagnetic properties. Temperature dependence of χ− 1 curve indicates a dominant ferromagnetic coupling above 50 K. Hysteresis curves suggest the presence of long range ordering at 5 K. The decrease of the field-cooled magnetization values around 5 K is due to the anti-ferromagnetic interaction between Mn2 + and Fe3 +. Unusual magnetic properties originate from the coexistence of ferromagnetic and antiferromagnetic exchange interactions.