Y-ferric oxide

Iron Sponge. An old method for removal of sulfur compounds involves contacting gases containing H2S and H2O with CC- or y-ferric oxide... 

Particulate Materials. There are three principal classes of particulate magnetic materials y-ferric oxide, y-Fe202, and its modifications chromium dioxide [12018-01 -8] and iron [7439-89-6]. A comparison of the remanent magnetization, and coercivity, for several y-Fe202... 

Ishikawa.T Nakasaki, H. Yasukawa, A. Kandori, K. Seto, M. (1999) Influences of Co ", Cu " and Cr " ions on the formation of magnetite. Corr. Sci. 41 1665-1680 Ishikawa.T Nitta, S. Kondo, S. (1986) Four-ier-transformation infrared spectroscopy of colloidal a-, P- and y-ferric oxide hydroxides. 

The temperatures and the length of the reduction and oxidation time are optimized and carefully controlled. To achieve good dispersibility and good orientability, surfaces of the particles are modified by chemical procedures after or prior to the reduction. The y-ferric oxide particles on the market are 0.2-0.5 p.m in length with aspect ratios of about 10. An electron micrograph of typical y-ferric oxide particles is shown in Figure 13.1.5. 

Greaves, C. (1983) A powder neutron diffraction investigation of vacancy and covalencein y-ferric oxide. Solid State Comm., 30, 257-63. 

Although iron particles can be prepared by variety of methods, most of the particles on the market are produced from geothite through dehydration and reduction processes [23, 33]. Therefore, most processes are the same as the production processes for y-ferric oxide particles. That is, dehydrated geothite particles are reduced into iron rather than magnetite, and the surface of the... 

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