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首页> 外文期刊>Applied Surface Science >Recent developments in the formation and structure of tin-iron oxides by laser pyrolysis
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Recent developments in the formation and structure of tin-iron oxides by laser pyrolysis

机译：激光热解法形成锡-铁氧化物的最新进展

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摘要

Complex oxides demonstrate specific electric and magnetic properties which make them suitable for a wide variety of applications, including dilute magnetic semiconductors for spin electronics. A tin-iron oxide Sn_(1-x)F_xO_2 nanoparticulate material has been successfully synthesized by using the laser pyrolysis of tetramethyl tin-iron pentacarbonyl-air mixtures. Fe doping of SnO_2 nanoparticles has been varied systematically in the 3-10at% range. As determined by EDAX, the Fe/Sn ratio (in at%) in powders varied between 0.14 and 0.64. XRD studies of Sn_(1-x)F_xO_2 nanoscale powders, revealed only structurally modified SnO2 due to the incorporation of Fe into the lattice mainly by substitutional changes. The substitution of Fe~(3+) in the Sn~(4+) positions (Fe~(3+) has smaller ionic radius as compared to the ionic radius of 0.69 A for Sn~(4+) with the formation of a mixed oxide Sn_(1-x)F_xO_2 is suggested. A lattice contraction consistent with the determined Fe/Sn atomic ratios was observed. The nanoparticle size decreases with the Fe doping (about 7 nm for the highest Fe content). Temperature dependent ~(57)Fe Mossbauer spectroscopy data point to the additional presence of defected Fe~(3+)-based oxide nanoclusters with blocking temperatures below 60 K. A new Fe phase presenting magnetic order at substantially higher temperatures was evidenced and assigned to a new type of magnetism relating to the dispersed Fe ions into the SnO_2 matrix.
机译：复合氧化物具有特定的电和磁特性，使其适合于多种应用，包括用于自旋电子器件的稀磁半导体。利用四甲基锡-五羰基铁-空气混合物的激光热解技术已经成功地合成了氧化锡铁-Sn_（1-x）F_xO_2。 SnO_2纳米粒子的Fe掺杂在3-10at％范围内系统地变化。如通过EDAX确定的，粉末中的Fe / Sn比（以原子％计）在0.14至0.64之间变化。对Sn_（1-x）F_xO_2纳米粉末的XRD研究表明，由于Fe主要是通过取代变化掺入晶格中，因此只有结构改性的SnO2。 Fe〜（3+）在Sn〜（4+）位置的取代（Fe〜（3+）的离子半径小于0.6〜9 A的Sn〜（4+）的离子半径，建议使用混合氧化物Sn_（1-x）F_xO_2。观察到与确定的Fe / Sn原子比一致的晶格收缩。纳米颗粒尺寸随Fe掺杂而减少（最高Fe含量约为7 nm）。 57）Fe Mossbauer光谱数据表明，存在缺陷态的Fe〜（3+）基氧化物纳米团簇，其阻断温度低于60K。新的Fe相在更高的温度下表现出磁序，并被证明是一种新型的Fe相。与分散到SnO_2基体中的Fe离子有关的磁性。

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  • 来源
    《Applied Surface Science》 |2011年第12期|p.5460-5464|共5页
  • 作者

    R. Alexandrescu; I. Morjan; F.Dumitrache; R. Birjega; C. Fleaca; I. Soare; L Gavrila; C. Luculescu; G. Prodan; V. Kuncser; G. Filoti;

  • 作者单位

    National Institute for Lasers, Plasma and Radiation Physics, POB MG-36, Bucharest 077125, Magurele, Romania;

    National Institute for Lasers, Plasma and Radiation Physics, POB MG-36, Bucharest 077125, Magurele, Romania;

    National Institute for Lasers, Plasma and Radiation Physics, POB MG-36, Bucharest 077125, Magurele, Romania;

    National Institute for Lasers, Plasma and Radiation Physics, POB MG-36, Bucharest 077125, Magurele, Romania;

    National Institute for Lasers, Plasma and Radiation Physics, POB MG-36, Bucharest 077125, Magurele, Romania;

    National Institute for Lasers, Plasma and Radiation Physics, POB MG-36, Bucharest 077125, Magurele, Romania;

    National Institute for Lasers, Plasma and Radiation Physics, POB MG-36, Bucharest 077125, Magurele, Romania;

    National Institute for Lasers, Plasma and Radiation Physics, POB MG-36, Bucharest 077125, Magurele, Romania;

    Ovidius University of Constanta, Bd. Mamaia 124, Constanta, Romania;

    National Institute of Materials Physics, POB MG-7, Bucharest 077125, Magurele, Romania;

    National Institute of Materials Physics, POB MG-7, Bucharest 077125, Magurele, Romania;

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  • 正文语种 eng
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  • 关键词

    tin oxide; nanoparticles; laser pyrolysis; fe doped sno_2; tin-iron oxides; mossbauer spectroscopy;

    机译：氧化锡;纳米粒子;激光热解;Fe掺杂sno_2;锡-铁氧化物;mossbauer光谱;

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