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首页> 外文期刊>Particle & Particle Systems Characterization: Measurement and Description of Particle Properties and Behavior in Powders and Other Disperse Systems >Iron Precursor Decomposition in the Magnesium Combustion Flame: A New Approach for the Synthesis of Particulate Metal Oxide Nanocomposites
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Iron Precursor Decomposition in the Magnesium Combustion Flame: A New Approach for the Synthesis of Particulate Metal Oxide Nanocomposites

机译：镁燃烧火焰中的铁前体分解：一种合成颗粒金属氧化物纳米复合材料的新方法

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摘要

Powders of Fe-Mg-O nanocomposite particles have been grown using a novel chemical vapor synthesis approach that employs the decomposition of a metalorganic precursor inside the metal combustion flame. After annealing in controlled gas atmospheres composition distribution functions, structure and phase stability of the obtained magnesiowustite nanoparticles are measured with a combination of techniques such as inductively coupled plasma-optical emission spectroscopy, energy dispersive X-ray spectroscopy, X-ray diffraction, and scanning and transmission electron microscopy. Complementary Mossbauer spectroscopy measurements reveal that depending on Fe loading and temperature of annealing either metastable and superparamagnetic solid solutions of Fe3+ ions in periclase (MgO) or phase separated mixtures of MgO and ferrimagnetic magnesioferrite (MgFe2O4) nanoparticles can be obtained. The described combustion technique represents a novel concept for the production of mixed metal oxide nanoparticles. Adressing the impact of selected annealing protocols, this study underlines the great potential of vapor phase grown non-equilibrium solids, where thermal processing provides means to trigger phase separation and, concomitantly, the emergence of new magnetic properties.
机译：使用新型化学蒸气合成方法生长Fe-Mg-O纳米复合颗粒的粉末，该方法采用金属燃烧火焰内的金属有机物前体的分解。在控制气体环境中的退火后，用诸如电感耦合等离子体光发射光谱，能量分散X射线光谱，X射线衍射和扫描的技术的组合测量所获得的镁烃纳米粒子的结构和相位稳定性。和透射电子显微镜。互补的Mossbauer光谱测量结果表明，根据MgO和铁磁性镁铁矿（MgE 2 O 4）纳米粒子（MgFe2O4）纳米颗粒的Fe3 +离子的Fe3 +离子的Fe3 +离子的Fe 3 +离子的亚稳态和超顺磁性固溶的温度。所描述的燃烧技术代表了混合金属氧化物纳米粒子的生产的新概念。采用所选退火方案的影响，该研究强调了气相生长非平衡固体的巨大潜力，其中热处理提供了触发相分离的手段，并且始终如一地出现新的磁性。

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