The metamorphosis of heterometallic trinuclear antiferromagnetic complexes into nano-sized superparamagnetic spinels.
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).
Vasylenko
Inna V
IV
L.V. Pisarzhevskii Institute of Physical Chemistry of the National Academy of Sciences of the Ukraine, prospekt Nauki 31, 03039 Kiev, Ukraine.
Gavrylenko
Konstiantyn S
KS
Il'yin
Vladimir G
VG
Golub
Vladimir
V
Goloverda
Galina
G
Kolesnichenko
Vladimir
V
Addison
Anthony W
AW
Pavlishchuk
Vitaly V
VV
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