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Effect of pressure on magnetic properties of magnetic nanoparticles, based on Prussian blue analogues, were studied in pressures up to 1.2 GPa. The Mn-3[Cr(CN)(6)](2) center dot nH(2)O and Ni-3[Cr(CN)(6)](2) center dot nH(2)O nanoparticles were prepared by reverse micelle technique. Transmission electron microscopy images show nanoparticles with average diameter of about 3.5 nm embedded in an organic matrix. The characteristic X-ray peaks of nanoparticles are more diffused and broader. Systems of nanoparticles behave as systems of interacting magnetic particles. The Curie temperature T-C is reduced from T-C = 56 K for Ni-Prussian blue analogues to T-C = 21 K for Ni-nanoparticles system and from T-C = 65 K for Mn-Prussian blue analogues to T-C = 38 K for Mn-nanoparticles system. One can explain this reduction of the Curie temperature and of the saturated magnetization mu(s) by dispersion of nanoparticles in an organic matrix i.e. by a dilution effect. Applied pressure leads to a remarkable increase in T-C for system of Mn-nanoparticles (Delta T-C/Delta p = +13 K/GPa) and to only slight decrease in T-C for system of Ni-nanoparticles (Delta T-C/Ap = -3 K/GPa). The pressure effect follows behavior of the mother Prussian blue analogues under pressure. The increase in saturated magnetization, attributed to compression of the organic matrix, is very small.

Effect of Pressure on Magnetic Properties of TM3[Cr(CN)6]2·nH2O Nanoparticles

Effect of Pressure on Magnetic Properties of TM₃[Cr(CN)₆]₂·nH₂O Nanoparticles