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PARTICLE SIZE EFFECTS ON THE THERMAL BEHAVIOUR OF MAGHEMITE SYNTHESISED BY FLAME PYROLYSIS

机译:粒径大小对火焰热解合成菱镁矿热性能的影响

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摘要

Thermal treatment of pure nanoscale maghemite (gamma-Fe2O3) powders under argon yields different products depending on particle size. Particles with a mean diameter above 15 nm transform to hematite (alpha-Fe2O3). Smaller particles, which were synthesised under identical conditions but from solutions with lower Fe3+ concentrations, transform into magnetite (Fe3O4) during thermal treatment. This phenomenon can be explained by adsorbed or incorporated reducing carboxylate groups. The origin of the reducing species and possible reaction mechanisms with the maghemite particles are discussed. (C) 1997 Elsevier Science B.V. [References: 14]
机译:在氩气下对纯纳米级磁赤铁矿(γ-Fe2O3)粉末进行热处理会根据粒径产生不同的产品。平均直径大于15 nm的粒子会转变为赤铁矿(α-Fe2O3)。在相同条件下但从具有较低Fe3 +浓度的溶液中合成的较小颗粒,在热处理过程中转变为磁铁矿(Fe3O4)。可以通过吸附或结合还原性羧酸盐基团来解释这种现象。讨论了还原物种的起源以及与磁赤铁矿颗粒的可能反应机理。 (C)1997 Elsevier Science B.V. [参考:14]

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