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arXiv cond-mat/0408480cond-mat.mtrl-sci
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新型溶胶-凝胶法制备Fe2O3纳米粒子及其结构和磁性表征

Synthesis of Fe2O3 nanoparticles by new Sol-Gel method and their structural and magnetic characterizations

Shakeel Akbar, S. K. Hasanain, Nasia Azmat, M. Nadeem

摘要:

采用改进的溶胶-凝胶法合成了22 ~ 56 nm的不同粒径的Fe 2 O3纳米粒子。通过X射线和穆斯堡尔谱测量获得并鉴定了纯α相颗粒以及α和γ相混合物的颗粒。不同的尺寸和相位控制参数已被确定。颗粒的平均尺寸随着凝胶的退火温度的增加而减小,并且随着(柠檬酸)浓度的增加而减小。退火温度影响两相的相对分数,从而影响颗粒的磁化强度。粒子的磁化强度(Ms)和矫顽力(Hc)随着退火温度的升高而一致地增加。对于相同的两相相对量,磁性(Hc)和颗粒的磁矩随着颗粒尺寸的减小而增加,表明表面效应在磁行为中的作用。

英文摘要:

Fe2O3 nanoparticles of different sizes ranging from 22 to 56nm were synthesized chemically by a modified sol-gel method. Pure alpha phase particles as well as particles with admixture of alpha and gamma phase were obtained and identified by x-ray and Mössbauer measurements. Different size and phase controlling parameters have been identified. The average size of the particles decreases with increased annealing temperature of the gel and decreases with the increase in the concentrations of the (citric acid). The annealing temperature affects the relative fractions of the two phases and consequently the magnetization of the particles. The magnetization of the particles (Ms) and coercivity (Hc) increase consistently with the increase in the annealing temperature. For the same relative amount of the two phases, the coercivity (Hc) and the moment of the particles increase with the decrease in the size of the particles, indicating the role of surface effects in the magnetic behaviour.

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