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首页> 外文期刊>Magnetics, IEEE Transactions on >Influences of Precursors Molar Ratio and Basic Agent on Processing of Nickel–Zinc Ferrite Nanopowders by a Sol-Gel Auto-Combustion Method
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Influences of Precursors Molar Ratio and Basic Agent on Processing of Nickel–Zinc Ferrite Nanopowders by a Sol-Gel Auto-Combustion Method

机译：前驱体摩尔比和碱性助剂对溶胶-凝胶自燃法处理镍锌铁氧体纳米粉的影响

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摘要

In the present investigation, nickel–zinc ferrite nanocrystalline powder has been prepared by a sol-gel auto-combustion technique using a gel including citric acid as a reductant and nitrates as oxidants. The results showed that the nitrate citrate gels exhibit a self- propagating behavior after ignition in air. The effects of Fe/(Ni, Zn) molar ratio and the kind of the basic agent on the thermal decomposition of the gels, and phase constitution, crystallite size, and morphology of the resultant powders were investigated by differential thermal analysis, thermo gravimetric analysis, X-ray diffraction, and transmission electron microscopy techniques. The results also revealed that in the presence of ammonia as a pH adjusting agent and Fe/(Ni, Zn) molar ratio of 2, the smallest crystallite size of nickel–zinc ferrite as 27 nm could be obtained directly after auto-combustion without the postcalcination process.
机译：在本研究中，镍-锌铁氧体纳米晶体粉末是通过溶胶-凝胶自动燃烧技术制备的，该技术使用的柠檬酸为还原剂，硝酸盐为氧化剂。结果表明，柠檬酸硝酸盐凝胶在空气中点燃后表现出自蔓延的行为。通过差示热分析，热重分析研究了Fe /（Ni，Zn）摩尔比和碱性试剂的种类对凝胶的热分解，相结构，微晶尺寸和形态的影响。 ，X射线衍射和透射电子显微镜技术。结果还表明，在存在氨作为pH调节剂且Fe /（Ni，Zn）摩尔比为2的情况下，自动燃烧后无需加热即可直接获得最小的镍锌铁氧体微晶尺寸为27 nm。后煅烧过程。

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