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首页> 外文期刊>CERAMICS INTERNATIONAL >Synthesis, structural and magnetic characterization of nanocrystalline CuFe_2O_4 as obtained by a combined method reactive milling, heat treatment and ball milling
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Synthesis, structural and magnetic characterization of nanocrystalline CuFe_2O_4 as obtained by a combined method reactive milling, heat treatment and ball milling

机译：通过反应研磨，热处理和球磨相结合的方法获得的纳米晶CuFe_2O_4的合成，结构和磁性表征

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摘要

Nanocrystalline copper ferrite has been synthesized using a combined method which involves reactive milling, heat treatment and mechanical milling. After 4 h of reactive milling a solid solution between the starting oxides (CuO and á-Fe_2O_3) and a spinel phase is obtained. Increasing the milling time leads to a decomposition of those phases. After a heat treatment of the 30 h milled sample a single spinel CuFe_2O_4 phase is obtained. By mechanical milling the crystallite size of the copper ferrite is reduced down to 9 nm after 1 h of milling. For the CuFe_2O_4 samples milled between 2 and 4 h a decomposition of this phase is remarked and á-Fe_2O_3 is formed during milling. The spontaneous magnetization of the spinel decreases with increasing the milling time as results of the partial redistribution of the cations in the spinel and of spin canted effect. The magnetization of the milled samples does not saturate due to the presence of very fine ferrite particles which are superparamagnetic.
机译：纳米晶的铁氧体铜已经使用包括反应研磨，热处理和机械研磨的组合方法合成。反应性研磨4小时后，在起始氧化物（CuO和α-Fe_2O_3）和尖晶石相之间获得固溶体。延长研磨时间会导致这些相的分解。经过30小时研磨的样品的热处理后，获得了单尖晶石CuFe_2O_4相。通过机械研磨，在研磨1小时后，铁氧体铜的微晶尺寸减小至9 nm。对于在2到4小时之间研磨的CuFe_2O_4样品，该相的分解很明显，在研磨过程中会形成á-Fe_2O_3。尖晶石的自发磁化强度随着研磨时间的增加而降低，这是由于阳离子在尖晶石中的部分重新分布以及自旋倾斜效应的结果。由于存在非常细的超顺磁性铁氧体颗粒，因此研磨后的样品的磁化强度不会饱和。

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