Structural and Chemical Alterations of Delta Fe2O3 and Their Effect on Magnetic Properties

摘要: The defect structure, δ-Fe2O3, was grown epitaxially with ultrafine, activated Al2Si2O5(OH)4. More uniform particle size and consistent structure result this process than auto-nucleation. low ferrimagnetic character is influenced by precipitation parameters. Magnetic properties crystal order can be promoted a novel thermal conversion using high-boiling aliphatic hydrocarbon. induces the formation of more complex iron oxide. A believed to form an higher δ-Fe2O3 but lower γ-Fe2O3. Analyses (C, H, CO2, H2O) are correlated magnetic properties. Specimens having mean 20 mμ were produced coercivities up 290 oe remanent inductions 1800 gauss/cm3. Stability tests over five-year period showed no degradation.