Ferromagnetic iron oxide

Electromagnetic separators sometimes are used as filters for the removal of ferromagnetic iron oxide from condensate and thus prevent it from being transported back to the boiler. 

There are some well-known methods of raising the efficiency of electric filters by increasing the autohesive forces between the particles. Ferromagnetic iron oxide particles merge and become larger under the influence of an electric field they then stick to the electrode surface in the shape of acicular formations [374]. The enlargement of the particles promotes a rise in the specific resistance and hence in the adhesion of the layer. 

We will describe here the behavior of ferromagnetic iron oxide nanoparticles in a PVA matrix synthesized by the in situ method [45] Reaction between the immobilized particles in the volume of polymer iron ions (which are attached by means of coordinating bonds to the PVA hydroxyl groups) and the OH" groups of NaOH followed by treatment in a reducing atmosphere leads to the formation of mixed iron oxide (Fe20j/Fe0) ferromagnetic nanoparticles. 

Mag netic Tapes. Chromium dioxide, Cr02, is used as a ferromagnetic material in high fidelity magnetic tapes (qv). Chromium dioxide has several technical advantages over the magnetic iron oxides generally used (58,246). 

Figure 5b. Variation in the magnetic properties of metal clusters are investigated by measuring the depletion of a highly collimated cluster beam by an inhomogeneous magnetic field. Fe clusters and their oxides (FexO and Fex02) at several applied fields. The uniform depletion of Fe clusters indicates that their magnetic moments increase approximately linearly with number of atoms, as would be anticipated for incipient ferromagnetic iron. Unexpected, however, is the much larger depletion of iron oxide clusters.

Discussion and Conclusion The chemical composition of iron oxides is useful to discriminate a range of mineral deposit types. Discriminant diagrams can be used to identify potential for specific mineral deposit types to occur in an area that has been glacially eroded using till. In this study, a small subset of the ferromagnetic fraction (50 grains, 0.5-1.0 mm size fraction) of a till has been shown to adequately display the compositional... 

---