Ion-beam-induced reduction of iron oxide supported on porous glass |
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| Institution: | 1. Departamento de Geología, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile. Plaza Ercilla 803, 13518 Santiago, Chile;2. Advanced Mining Technology Center, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile. Avenida Tupper 2007, 8370451 Santiago, Chile;3. Departamento de Geofísica, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile. Avenida Blanco Encalada 2002, 8370449 Santiago, Chile;4. Facultad de Ingeniería, Universidad Andres Bello, Campus República, Santiago. Avenida República 237, 8370146 Santiago, Chile;5. Departamento de Ingeniería Estructural y Geotécnica, Pontifica Universidad Católica de Chile, Av. Vicuña Mackenna 4860, Macul, 7820436 Santiago, Chile |
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| Abstract: | When ferric oxide supported on porous glass was irradiated by 40 keV He+ ions, the reduction of Fe3+ to Fe2+ species occurred. The yield of Fe2+ species, which was monitored by the Mössbauer spectroscopic measurement, increased with increasing total dose, and went up to ca. 80%. This unexpectedly large yield meant that the effect was exerted beyond the range of the incident He+ ions. Clear dose rate dependence of the Fe2+ yield was also observed. We examined the possibility that the reduction of the Fe3+ species was caused by some type of gaseous reductant produced by radiolysis of surface chemical species such as physisorbed water molecules and surface hydroxyls. |
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