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. 2010 May 15;121(1-2):47-52.
doi: 10.1016/j.matchemphys.2009.12.040.

The metamorphosis of heterometallic trinuclear antiferromagnetic complexes into nano-sized superparamagnetic spinels

Inna V Vasylenko  1 , Konstiantyn S Gavrylenko, Vladimir G Il'yin, Vladimir Golub, Galina Goloverda, Vladimir Kolesnichenko, Anthony W Addison, Vitaly V Pavlishchuk
Affiliations

The metamorphosis of heterometallic trinuclear antiferromagnetic complexes into nano-sized superparamagnetic spinels

Inna V Vasylenko et al. Mater Chem Phys. .

Abstract

Thermal decomposition of the trinuclear heterometallic oxoacetates [Fe(2)M(μ(3)-O)(CH(3)COO)(6)(H(2)O)(3)] has been used as a single-precursor method for synthesis of the spinel-structured ternary oxides MFe(2)O(4) (M = Mn(II), Co(II), and Ni(II)). This facile process occurring at 320 °C results in the formation of nanocrystalline, (7-20 nm) highly pure stoichiometric ferrites in quantitative yield. The magnetic properties of these nanoparticulate ferrites were studied in the 10-300 K temperature range, revealing superparamagnetic behaviour for the Ni and Mn particles and ferromagnetic behavior for the Co ones at room temperature. Their blocking temperatures follow the order: CoFe(2)O(4) > MnFe(2)O(4) > NiFe(2)O(4).

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Figures

Figure 1
Figure 1
Molecular structure of the precursor complexes [Fe2M(μ3-O)(CH3COO)6(H2O)3]·2H2O (M = MnII, CoII, and NiII)
Figure 2
Figure 2
Typical X-ray diffraction pattern for Mn, Co and Ni ferrites synthesized by sintering of heterometallic trinuclear oxo-acetate complexes [Fe2M(μ3-O)(CH3COO)6(H2O)3]·2H2O (M = MnII, CoII, and NiII).
Figure 3
Figure 3
TEM image for CoFe2O4 nanocrystals.
Figure 4
Figure 4
M vs H curves of spinels at 300 and 10 K: a - MnFe2O4; b -CoFe2O4; c - NiFe2O4.
Figure 5
Figure 5
Zero field cooling and field cooling (50 Oe) magnetization curves of spinels: a - MnFe2O4; b - CoFe2O4; c - NiFe2O4.
See this image and copyright information in PMC

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