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Influence of hydroxyapatite on maghemite-to-hematite phase transfer of FeO x -hydroxyapatite composite |
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| Authors: | Kunfeng Zhao Xin Liu Changzi Jin Fuhai Yu Alexandre Rykov Junhu Wang Tao Zhang |
| Institution: | 1. State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, 116023, China 2. Graduate University of Chinese Academy of Sciences, Beijing, 100049, China 3. M?ssbauer Effect Data Center, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, 116023, China |
| Abstract: | FeO x -hydroxyapatite (FeO x -HAP) composites with different FeO x contents were prepared, and compared with pure FeOx, the FeO x -HAP composites exhibit strongly magnetic behavior in an external magnetic field even after 600 °C calcination. The combination of 57Fe Mössbauer and Fe K-edge XAFS indicates that HAP can stabilize the size and crystal phase of γ-Fe2O3 during heat treatment. Even after 600 °C calcination, the interaction imposed by HAP could produce large amounts of distorted octahedral coordination Fe sites in the interior lattice and then result in strong magnetism. The thermally stable γ-Fe2O3-HAP composites may provide a new opportunity for developing efficient supported crystal-dependent catalysts. |
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