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Cu1.5[Cr(CN)6]⋅6.5H2O nanoparticles: synthesis, characterization, and magnetic properties

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Abstract

We have synthesized nanoparticles of Cu1.5[Cr(CN)6]⋅6.5H2O of varying size by using poly(vinylpyrrolidone) (PVP) as a protecting polymer. The particle size variation has been achieved by varying the amount of the PVP surfactant with the reactants. The prepared nanoparticles have been investigated by using X-ray diffraction, transmission electron microscopy, and direct-current magnetization techniques. The nanoparticles crystallize in a face centred cubic structure (space group: Fm3m). The approximate particle sizes for the three samples are 18, 9, and 5 nm, respectively. Non-PVP nanoparticles (18 nm) show a magnetic ordering temperature of 65 K. A decrease in the magnetic ordering temperature was observed with decreasing particle size. These nanoparticles are magnetically very soft, showing negligibly small values of the coercivity and remanent magnetization. The maximum magnetization and spontaneous magnetization values at 5 K are found to decrease with decreasing particle size. The observed magnetization behaviour of the nanoparticles has been attributed to the increasing surface spin disorder with decreasing particle size.

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Authors and Affiliations

  1. Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai, 400085, India

    Amit Kumar & S. M. Yusuf

  2. Technical Physics & Prototype Engineering Division, Bhabha Atomic Research Centre, Mumbai, 400085, India

    J. V. Yakhmi

Authors
  1. Amit Kumar
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  2. S. M. Yusuf
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  3. J. V. Yakhmi
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Correspondence to S. M. Yusuf.

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Kumar, A., Yusuf, S.M. & Yakhmi, J.V. Cu1.5[Cr(CN)6]⋅6.5H2O nanoparticles: synthesis, characterization, and magnetic properties. Appl. Phys. A 99, 79–83 (2010). https://doi.org/10.1007/s00339-009-5512-8

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  • DOI: https://doi.org/10.1007/s00339-009-5512-8

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