Effects of doping on the thermal stability of spindle-shaped γ-Fe2O3 particles |
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| Authors: | Hongmei Luo Huanxing Zeng |
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| Institution: | (1) Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, 230026 Auhui, P. R. China |
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| Abstract: | Spindle-shaped α-FeOOH particles were synthesized using the chemical coprecipitation method in Fe(CO3)x(OH)2(?x) suspensions system by adding metallic ions. The spindle-shaped γ-Fe2O3 particles were obtained by dehydration of α-FeOOH, and subsequent reduction and oxidation. Its thermal stability was investigated by differential thermal analysis (DTA). It was found that the transition temperature of γ-Fe2O3→α-Fe2O3 of samples doped with metallic ions is higher than that of the pure γ-Fe2O3 and increasing with increase of the size of the metallic ions, and γ-Fe2O3 by doping with two or more different metallic ions together has even higher thermal stability. The origin of the improved thermal stability was discussed. Additionally, the magnetic properties of γ-Fe2O3 were measured. |
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| Keywords: | DTA γ -Fe2O3 thermal stability spindle-shaped |
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