Enhanced magnetostrictive properties of CoFe2O4 synthesized by an autocombustion method
Enhanced magnetostrictive properties of CoFe2O4 synthesized by an autocombustion method
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DOI：
10.1016/j.sna.2007.03.016
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发表时间：
2007-07-04
影响因子：
4.6
通讯作者：
Joy, P. A.
中科院分区：
文献类型：
--
作者：
Bhame, S. D.;Joy, P. A.
比较了低温法（柠檬酸法、共沉淀法和自燃法）和高温陶瓷法合成纳米晶粉末制备的烧结钴铁氧体的磁致伸缩性能。磁致伸缩应变对铁素体颗粒的初始形貌和最终烧结产物的微观结构有很强的依赖性。通过自燃烧方法合成的纳米颗粒具有片状和多孔的形貌，可以获得具有小颗粒的烧结材料。最大磁致伸缩随晶粒尺寸的增大而减小。然而，粉末的初始粒度或烧结密度与磁致伸缩之间没有相关性。平均晶粒尺寸为8 μ m（燃烧）、17 μ m（柠檬酸盐）、23 μ m（共沉淀）和25 μ m（陶瓷）的烧结样品的最大磁致伸缩值分别为197、184、159和135 ppm。(c) 2007 Elsevier B.V.版权所有
The magnetostrictive properties of sintered cobalt ferrite derived from nanocrystalline powders synthesized by three different low-temperature methods (citrate, coprecipitation and autocombustion) and the high-temperature ceramic method have been compared. A strong dependence of the magnetostrictive strain is observed on the initial morphology of the ferrite particles and the microstructure of the final sintered product. The nanoparticles synthesized by the autocombustion method, with a flaky and porous morphology, give a sintered material with small grains. Maximum magnetostriction is found to be decreased with increasing grain size. However, no correlation is observed between the initial particle size of the powders or the sintered density and magnetostriction. Maximum magnetostriction values of 197, 184, 159, and 135 ppm are obtained for the sintered samples with average grain sizes of 8 mu m (combustion), 17 mu m (citrate), 23 mu m (coprecipitation), and > 25 mu m (ceramic), respectively. (c) 2007 Elsevier B.V. All rights reserved.