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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >The role of surfactant in synthesis of magnetic nanocrystalline powder of NiFe2O4 by sol-gel auto-combustion method
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The role of surfactant in synthesis of magnetic nanocrystalline powder of NiFe2O4 by sol-gel auto-combustion method

机译：表面活性剂在溶胶-凝胶自燃烧法合成NiFe2O4纳米磁性粉中的作用

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摘要

In this work, a new sol-gel auto-combustion method has been performed to synthesize single phase nickel ferrite nanocrystalline powders by using n-cetyltrimethylammonium bromide, as a cationic surfactant. The gels were prepared from ferric and nickel nitrates and citric acid. Ammonia was used as pH adjusting agent as well. The effects of the surfactant on the after combustion calcination process and the reduction of the resulting powder crystallite size which affects the magnetic properties of the material were investigated by XRD and DTA/TGA techniques. The results showed that the ignition of the gels in air have a self-propagating behavior. Addition of surfactant to the starting solution affected the crystallite size of the synthesized powders and their phase constitution. The crystallite size of nickel ferrite powder in sample with surfactant was obtained 31.2 nm. The other important result of this study was production of single phase nickel ferrite directly after combustion while without surfactant the nickel ferrite single phase was obtained only after a post-calcination process at 1000 degrees C.
机译：在这项工作中，通过使用正十六烷基三甲基溴化铵作为阳离子表面活性剂，进行了一种新的溶胶-凝胶自燃方法来合成单相镍铁氧体纳米晶粉末。所述凝胶由硝酸铁和硝酸镍以及柠檬酸制备。氨也用作pH调节剂。通过XRD和DTA / TGA技术研究了表面活性剂对后煅烧过程的影响以及所产生的粉末微晶尺寸的减小对材料磁性的影响。结果表明，凝胶在空气中的点燃具有自蔓延行为。在起始溶液中加入表面活性剂会影响合成粉末的微晶尺寸及其相组成。获得具有表面活性剂的样品中的铁氧体镍粉末的微晶尺寸为31.2nm。这项研究的另一个重要结果是燃烧后直接生产单相镍铁氧体，而没有表面活性剂，仅在1000摄氏度的后煅烧过程之后才获得单相镍铁氧体。

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