The formation of needle-like particles of xCoFe2O4(1-x)Fe3O4 with x.LEQ.0.2.

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An experimental study was made of the oxidation with air of alkaline suspensions containing needle-like Fe3O4 particles and slight amounts of Co1⁄3/Fe2⁄3(OH)2 at temperatures between 60 and 90 °C, together with the properties of the resulting oxidation products. It has been found that the Hc (coercivity) values of the products were greatly affected by both the excess NaOH concentration and the oxidation temperature—i.e., the two essential factors in determining the difference in the properties of a cobalt ferrite layer coated on the Fe3O4 particles, that these values increased with the heat treatment in vacuo of the products within the temperature range of 200 to 450 °C, without decreasing the saturation magnetization values, and that the Hc increment was mainly governed by the Co content.
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