Oxygen Uptake and Release Mechanism of Lithium Manganese Ferrite in the Low Temperature Range of 573–773 K |
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| Authors: | Taizo Sano Masamichi Tsuji Nobuyuki Gokon Hiroshi Kaneko Yutaka Tamaura |
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| Affiliation: | Department of Chemistry, Research Center for Carbon Recycling and Utilization, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo 152-8552, Japan |
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| Abstract: | Oxygen uptake and release of (Li,Mn) ferrite LMF; (Li0.60Mn1.20Fe1.20)1?δO4; δ= 0.007 to 0.033] was investigated concerning the relations between redox reactions of ferrite and cation migration. Mössbauer spectroscopy and X-ray diffractometry showed that some of the Li+ and Fe3+ ions migrated from the A sites to the B sites of the spinel-type structure and Mn4+ ions migrated from the B sites to the A sites during oxygen uptake at 573 K. The cation-deficient LMF formed by the oxygen uptake released oxygen molecules in He gas only at 660 K. The cation migration during the oxygen release was in the opposite direction of the movement during oxygen uptake at 573 K. |
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| Keywords: | oxygen lithium ferrites |
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