Structural and magnetic properties of the copper ferrite obtained by reactive milling and heat treatment
Structural and magnetic properties of the copper ferrite obtained by reactive milling and heat treatment
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DOI：
10.1016/j.ceramint.2012.10.274
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发表时间：
2013-05-01
影响因子：
5.2
通讯作者：
Isnard, Olivier
中科院分区：
文献类型：
--
作者：
Marinca, Traian Florin;Chicinas, Ionel;Isnard, Olivier
以铜和铁的氧化物为原料，通过机械合成和热处理合成了铁酸铜（CuFe 2 O 4）。在机械合成之后，取决于研磨时间，粉末由相的混合物组成。在600摄氏度下的热处理不会导致机械活化前体的完全反应。在800和1000摄氏度的热处理后，注意到几乎所有的研磨时间都完全形成了铜铁氧体。发现在1000 ℃下热处理的所有样品的铜铁氧体的晶体结构是立方的，并且在800 ℃下热处理的样品的晶体结构是四方和立方的混合物。随着球磨时间的延长，样品中立方结构的铁酸铜的量占主导地位，并且随着球磨时间的增加，四方形变减少。球磨时间延长后的样品中CuFe_2 O_4的立方结构的结晶受到粉末铁污染的影响。发现在1000摄氏度下热处理后获得的样品的磁化作用比在800摄氏度下热处理的样品的磁化作用大。铁污染、球磨时间和热处理温度影响阳离子分布，从而导致铜铁氧体样品的饱和磁化强度从11.9 μ（B）/f. u.至16.4 mu（B）/f.u. (C)2012 Elsevier Ltd和Techna Group S.r.l. All rights reserved.
Copper ferrite (CuFe2O4) was synthesised from an equimolar mixture of copper and iron oxides by mechanosynthesis and subsequent heat treatment. After mechanosynthesis, depending on the milling time, the powder consists in a mixture of phases. The heat treatment at 600 degrees C did not lead to a complete reaction of the mechano-activated precursors. After the heat treatments at 800 and 1000 degrees C, the complete formation of copper ferrite for almost all the milling times was noticed. The crystal structure of the copper ferrite was found to be cubic for all the samples heat treated at 1000 degrees C and a mixture of tetragonal and cubic for the samples heat treated at 800 degrees C. The amount of copper ferrite with cubic structure predominates in the samples with prolonged milling duration and a decrease of the tetragonal distortion by increasing the milling time occurs. The crystallisation of CuFe2O4 in cubic structure for the samples milled for prolonged time is influenced by the powder contamination with iron. The magmetisations of the samples obtained after heat treatment at 1000 degrees C were found to be larger compared to the ones of the samples heat treated at 800 degrees C. The iron contamination, milling duration and heat treatment temperature influence the cations distribution, thus leading to the saturation magnetisation of the copper ferrite samples ranging from 11.9 mu(B)/f.u. to 16.4 mu(B)/f.u. (C) 2012 Elsevier Ltd and Techna Group S.r.l. All rights reserved.