【作者】 李文峰；

【导师】 王建波；

【作者基本信息】 兰州大学 ， 凝聚态物理， 2008， 硕士

【摘要】 NiZn铁氧体由于其具有高的电阻率和很好的高频特性,在高频抗电磁干扰领域获得广泛应用。铁氧体材料的化学组成和微观结构对其性能有很大的影响,而这些因素又与铁氧体的制备方法密切相关,选择一种适当的制备方法是获得高性能NiZn铁氧体的关键,因此铁氧体的制备方法一直是该研究领域的一个重要课题。本文使用了一种新的制备NiZn铁氧体的工艺——低热固相反应法成功制备了Ni_1-xZn_xFe₂O₄（x=0.50,0.55,0.60,0.65,0.70）纳米颗粒。用此方法制备NiZn铁氧体,其成相温度远低于传统固相法,且具有产物粒径小、分布均匀,制备过程简单,所需设备简易,成本低的优点。同时本文选取糖类作为络合剂使用溶胶—凝胶法首次制备了Ni_0.4Zn_0.6Fe₂O₄纳米颗粒,与使用PVA、柠檬酸等作为络合剂制备的NiZn铁氧体相比,其具有制备温度低,粒径小、分布均匀,原料成本低且对人身健康无害的特点。并且在实验中发现,在一定的金属离子与糖类分子比例下制备的颗粒具有致密紧连的表面形貌,这一点在相关文献中未见报导。更多还原

【Abstract】 NiZn ferrite has comprehensive applications in anti-electromagnetic interference area for its high resistivity and good high-frequency property. The magnetic properties of NiZn ferrites are highly sensitive to components and microstructures which closely relate to synthesis method. So choosing an appropriate synthesis method is very important to obtain excellent performances, and that’s why the synthesis method is being investigated as an important issue.This paper presents synthesizing Ni_1-xZn_xFe₂O₄（x=0.50, 0.55, 0.60, 0.65, 0.70） nanoparticles by low heating temperature solid state reaction （LTSSR）. The NiZn ferrite particle synthesized by LTSSR method has small grain size and homogeneous distribution. And phase formation temperature is far below the one used traditional solid phase reaction. Moreover, the equipment requirement and synthesizing procedure are simple.And this paper first report synthesizing NiZn ferrite nanoparticles based on sol-gel method using saccharide as chelator. Contrasting synthesis with PVA, citric acid etc., using saccharide as chelator has such merits as low synthesizing temperature, small grain size and homogeneous distribution nanoparticle, low cost and harmlessness. Moreover, the particles present compact and conterminous morphology if metallic ions and saccharide molecule are under certain proportion. This may has interesting applications and haven’t been reported elsewhere yet.更多还原