Mn, CoおよびAl含有α-FeOOH微粒子の脱水反応

概要

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Effects of doped Mn3+, Co3+ and Al3+ ions in α-FeOOH nanoparticles on the dehydration reaction of α-FeOOH to hematite were investigated by a differential scanning calorimetry analysis. Effect of doped Mn3+ ion on the structure and morphology of α-FeOOH was also investigated.In α-FeOOH nanoparticles containing Mn, Mn3+ ions were all incorporated into α-FeOOH crystals at Mn/Fe mole ratio; 0 to 0.28, and an acicular shape of particles was maintained after adding Mn3+ ions to α-FeOOH. Dependence of normalized interplanar spacing on Mn contents was also made clear in α-FeOOH particles containing Mn.Dependences of the differential scanning calorimetry of the dehydration reaction on the rate of heating were clarified in α-FeOOH particles containing Mn, Co and Al. Endothermic reaction was detected in DSC curves. Relationships between peak temperatures of endothermic reaction and the Mn, Co and Al contents were clarified in α-FeOOH particles containing Mn, Co and Al. Peak temperatures increase with increasing cation contents.In either case of α-FeOOH particles containing Mn, Co and Al, good linear relationships between the rates of heating and the peak temperatures of endothermic reaction were obtained by using Ozawas method. Dependences of activation energies of dehydration reaction on cation contents were clarified in α-FeOOH particles containing Mn, Co and Al.
社団法人粉体粉末冶金協会の論文
2007-02-15