Effect of Pressure on Magnetic Properties of TM_3[Cr(CN)_6]_2 · nH_2O Nanoparticles

• Authors: A. Zentko , M. Zentková , V. Kavečanský , M. Mihalik , Z. Mitróová , Z. Arnold , J. Kamarád , M. Cieslar , V. Zeleňák
• Languages of publication: EN

Abstracts

EN

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·nH_2O and Ni_3[Cr(CN)_6]_2·nH_2O 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 magnetizationμ_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 (ΔT_C/Δp = +13 K/GPa) and to only slight decrease in T_C for system of Ni-nanoparticles (ΔT_C/Δp = -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.

Keywords

EN

75.30.Cr; 75.50.Ee; 75.50.Gg; 75.50.Xx

Discipline

• 75.30.Cr: Saturation moments and magnetic susceptibilities
• 75.50.Gg: Ferrimagnetics
• 75.50.Ee: Antiferromagnetics
• 75.50.Xx: Molecular magnets

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2008
• Volume: 113
• Issue: 1
• Pages: 489-493

Dates

published

2008-01

received

2007-07-09

Contributors

author

A. Zentko

• Institute of Experimental Physics, Slovak Academy of Sciences, 040 01 Košice, Slovak Republic

author

M. Zentková

• Institute of Experimental Physics, Slovak Academy of Sciences, 040 01 Košice, Slovak Republic

author

V. Kavečanský

• Institute of Experimental Physics, Slovak Academy of Sciences, 040 01 Košice, Slovak Republic

author

M. Mihalik

• Institute of Experimental Physics, Slovak Academy of Sciences, 040 01 Košice, Slovak Republic

author

Z. Mitróová

• Institute of Experimental Physics, Slovak Academy of Sciences, 040 01 Košice, Slovak Republic

author

Z. Arnold

• Institute of Physics of the AS CR, v.v.i., Na Slovance 2, 182 21 Prague 8, Czech Republic

author

J. Kamarád

• Institute of Physics of the AS CR, v.v.i., Na Slovance 2, 182 21 Prague 8, Czech Republic

author

M. Cieslar

• Charles University, Ke Karlovu 5, 121 16 Prague 2, Czech Republic

author

V. Zeleňák

• P.J. Šafárik University, Moyzesova 11, 04154 Košice, Slovakia

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Identifiers

DOI

10.12693/APhysPolA.113.489