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首页> 外文期刊>Physica, B. Condensed Matter >Magnetic interactions in high-energy ball-milled NiZnFe2O4/SiO2 composites
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Magnetic interactions in high-energy ball-milled NiZnFe2O4/SiO2 composites

机译:高能球磨NiZnFe2O4 / SiO2复合材料中的磁性相互作用

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Composites Ni0.5Zn0.5Fe2O4/SiO2 are obtained after high-energy ball milling precursor oxides, in stoichiometric proportions, for 200 h at room temperature and further isothermal annealing for 111 at 1273 K, under air and argon atmosphere, respectively. After 200 It grinding, a complex microstructure develops with small hematite crystals mixed with SiO2 and remanent NiO and ZnO particles, and very small NiZn ferrite clusters, reaching a mean size of similar to 9 nm. The high temperature treatments remove the hematite grains from the powder and promote the growth of NiZn ferrite grains to reach mean sizes nearly similar to 20 nm. For treatments in oxidizing atmospheres, the major phases are SiO2 and NiZn ferrite, while for annealing in Ar a new phase appears, fayalite, which is paramagnetic at room temperature. The M-H loops are all well described by the sum of a ferromagnetic and a superparamagnetic-like contribution. The observed properties are interpreted considering the different magnetic phases obtained, their crystal sizes and their mutual interactions. (c) 2007 Elsevier B.V. All rights reserved.
机译:Ni0.5Zn0.5Fe2O4 / SiO2复合材料是在高能球磨前驱体氧化物在室温下以化学计量比反应200小时,然后在空气和氩气气氛下以1273 K进行等温退火分别获得111。在200 It研磨后,会形成复杂的显微组织,其中混有SiO2的小赤铁矿晶体和剩余的NiO和ZnO颗粒,以及非常小的NiZn铁氧体簇,平均尺寸接近9 nm。高温处理可从粉末中去除赤铁矿晶粒,并促进NiZn铁氧体晶粒的生长,使其平均尺寸接近20 nm。对于在氧化气氛中进行处理,主要相为SiO2和NiZn铁氧体,而对于在Ar中退火,则出现了新相,铁橄榄石,在室温下为顺磁性。通过铁磁和类超顺磁性的贡献之和,可以很好地描述M-H回路。考虑到获得的不同磁相,它们的晶体尺寸和它们的相互作用,解释了观察到的性质。 (c)2007 Elsevier B.V.保留所有权利。

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