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| - High-Quality Fe and γ-Fe2O3 Magnetic Thin Films from anEpoxide-Catalyzed Sol−Gel Process
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| - High-quality amorphous Fe3+ oxide/hydroxide thin films were fabricated through an epoxide-catalyzedsol−gel process in which hexaaquo Fe3+ salts were condensed in an alcoholic medium with propyleneoxide. After addition of the propylene oxide, but prior to gelation, the solution was spin-coated ontoquartz disks. The Fe3+ oxide/hydroxide films that formed were extremely uniform and homogeneouswith a film thickness of ∼0.1 μm. Processing of these films under either oxidizing or reducing conditionsallows them to be converted into magnetic iron or iron oxide phases. Calcination under an inert atmosphereat 600 °C cleanly converts the Fe3+ oxide/hydroxide gel to hematite (α-Fe2O3), while reduction of eitherthe Fe3+ gel films directly or the hematite films in a dilute H2 flow produces metallic iron. The iron filmsproduced from either of these methods are characterized by a distribution of submicrometer particles onthe surface. The metallic iron particles can ultimately be converted to well-formed maghemite (γ-Fe2O3)particles through slow reoxidation. Magnetic susceptibility measurements taken parallel and perpendicularto the surface indicate that both the iron and the maghemite are anisotropic, showing evidence of long-range interactions parallel to the surface.
- High-quality thin films are fabricated from a epoxide-catalyzed sol−gel process in which aquated Fe3+ ions are condensed with propylene oxide. This gel forms uniform thin films of ∼0.1 μm thickness. Once formed, these films can be processed to produce α-Fe2O3 or metallic Fe. The Fe films are composed of discrete submicron particles that can be oxidized to achieve highly crystalline γ-Fe2O3 magnetic films.
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