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首页> 外文期刊>Materials Science and Engineering. B, Solid-State Materials for Advanced Technology >Surface effects on the magnetic behavior of nanocrystalline nickel ferrites and nickel ferrite-polymer nanocomposites
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Surface effects on the magnetic behavior of nanocrystalline nickel ferrites and nickel ferrite-polymer nanocomposites

机译：表面效应对纳米晶镍铁氧体和镍铁氧体聚合物纳米复合材料磁性能的影响

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摘要

The magnetization studies on nanocrystalline nickel ferrite as powder particles, and as diluted dispersion (10wt. percent) in polymer matrix (polymer nanocomposites) are presented. The two polymer-based nanocomposites were prepared via ball-milling and in situ polymerization, respectively. The magnetization measurements provide strong evidence of surface effects to magnetization, which explains the non-saturation of magnetization at high fields. The differences in the magnetization behavior of nickel ferrite as powder particles and in the ball-milled nanocomposite and the nanocomposite prepared via in situ polymerization are attributed to the different extent of interparticle interactions between the particles and the preparation route. The magnetization versus applied field behavior of the three ferrite systems show a similar jump in the initial part of the magnetization curve in all the cases which implies the existence of a core-shell like morphology of the particles over a large temperature range and its dominance over the interparticle interaction effects between the particles.
机译：提出了对纳米晶镍铁氧体作为粉末颗粒以及在聚合物基质（聚合物纳米复合材料）中的稀释分散液（10wt。％）的磁化研究。这两种基于聚合物的纳米复合材料分别通过球磨和原位聚合制备。磁化强度的测量为磁化强度的表面效应提供了有力的证据，这解释了高磁场下磁化强度的非饱和性。镍铁氧体作为粉末颗粒的磁化行为以及通过原位聚合制备的球磨纳米复合材料和纳米复合材料的磁化行为差异归因于颗粒之间的颗粒间相互作用程度和制备途径。在所有情况下，三种铁氧体系统的磁化强度与外加磁场特性在磁化曲线的初始部分都显示出类似的跃变，这表明在较大的温度范围内，存在类似核壳形的粒子形态，并且其在粒子之间的粒子间相互作用。

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