CEMS study on iron film oxidized in various oxygen pressures |
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| Authors: | T Toriyama K Ueoka T Hashimoto K Hisatake K Kitayama |
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| Institution: | (1) Department of Applied Physics, Tokyo Institute of Technology, 152 Tokyo, Japan;(2) Physics, Jissen Women's University, 191 Tokyo, Japan;(3) Department of Chemistry, Tokyo Institute of Technology, 152 Tokyo, Japan;(4) Present address: Physics Department, Musashi Institute of Technology, 158 Tokyo;(5) Present address: Mitsubishi Research Institute Inc., 100 Tokyo, Japan |
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| Abstract: | In order to prepare the Fe1?xO film, Fe metals evaporated on sapphire substrate were oxidized in the furnace for 2 hours at 800°C. The pressure of oxygen between 10?14 and 10?19 atm. was controlled by changing the flow rates of CO2 and H2 gases. After the oxidation, the conversion Mössbauer spectra for the samples were measured by a He+10%CH4 proportional counter. It was found that at this temperature the usually accepted Fe1?xO was not made for 2 hours, but the unknown oxidation state of Fe was formed at the oxygen pressure of 10?16.5 alm.. Its isomer shift relative to α-Fe and quadrupole splitting are 0.92 mm/sec and 1.71 mm/sec. The normal Fe1?xO was formed at the oxygen pressure of 10?16.5 atm. when the oxidation time was extended to 6.5 hours, in addition to Fe3O4. |
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