Synthesis and magnetic properties of cobalt ferrite (CoFe2O4) nanoparticles prepared by wet chemical route
Synthesis and magnetic properties of cobalt ferrite (CoFe2O4) nanoparticles prepared by wet chemical route
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DOI：
10.1016/j.jmmm.2006.06.003
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发表时间：
2007-01-01
影响因子：
2.7
通讯作者：
Ceylan, Abdullah
中科院分区：
文献类型：
--
作者：
Maaz, K.;Mumtaz, Arif;Ceylan, Abdullah
以稳定的铁盐和钴盐为原料，油酸为表面活性剂，采用湿化学法合成了磁性钴铁氧体纳米颗粒。x射线衍射（XRD）和透射电子显微镜（TEM）证实，根据退火温度和时间的不同，在15 ~ 48℃范围内形成了单相钴铁氧体纳米颗粒。晶粒尺寸随退火温度和时间的增加而增大，矫顽力达到最大值，在28 run左右达到峰值。在冷却至77 K时观察到非常大的矫顽力（10.5 kOe），而在约260 K以下观察到典型的阻塞效应。高场强矩为(c) 2006 Elsevier B.V.版权所有。
Magnetic nanoparticles of cobalt ferrite have been synthesized by wet chemical method using stable ferric and cobalt salts with oleic acid as the surfactant. X-ray Diffraction (XRD) and Transmission Electron Microscope (TEM) confirmed the formation of single-phase cobalt ferrite nanoparticles in the range 15-48 urn depending on the annealing temperature and time. The size of the particles increases with annealing temperature and time while the coercivity goes through a maximum, peaking at around 28 run. A very large coercivity (10.5 kOe) is observed on cooling down to 77 K while typical blocking effects are observed below about 260 K. The high field moment is (c) 2006 Elsevier B.V. All rights reserved.