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The preparation of Co/Fe alloy fine particles from HFeCo3(CO)12

Lambrick, David B. and Mason, N. and Hoon, Steve R. and Kilner, M. and Chapman, J.N. (1988) The preparation of Co/Fe alloy fine particles from HFeCo3(CO)12. Transactions on magnetics, 24 (2). pp. 1644-1646. ISSN 0018-9464

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Abstract

The preparation and properties of magnetic fluids containing fine particles of Co/Fe 'alloys' are reported. The alloy nature of single particles has been confirmed by local area energy-dispersive X-ray analysis at very high spatial resolution in transmission electron microscopy. These particles have been prepared by the decomposition of a mixed-metal organometallic precursor, HFeCo3(CO)12, in the presence of surfactants. Two principal compositions have been observed, one of 3:1 Co:Fe as in the precursor molecule and another of 8:1 Co:Fe. Electron microscopy has also revealed mean particle diameters in the range 6-8 nm and narrow size distributions. In the case of one fluid, the proportion of metal atoms in the precursor converted to metal in the ferromagnetic state is estimated to be approximately 84% before oxidation. The kinetics of the decomposition show differences in detail compared to those of Co4(CO)12.

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