纳米Dy0.15Fe1.85O3磁颗粒的低温磁特性研究

doi:10.3724/SP.J.1077.2012.12018

无机材料学报 ›› 2012, Vol. 27 ›› Issue (11): 1174-1178.DOI: 10.3724/SP.J.1077.2012.12018 CSTR: 32189.14.SP.J.1077.2012.12018

纳米Dy_0.15Fe_1.85O₃磁颗粒的低温磁特性研究

张茂润, 孙静静, 陈静

(安徽理工大学化工学院, 淮南 232001)

收稿日期:2012-01-06 修回日期:2012-03-31 出版日期:2012-11-20 网络出版日期:2012-10-25
基金资助:
安徽省教育厅自然科学基金(2006Kj143B)

Study on Magnetic Properties of Dy_0.15Fe_1.85O₃ Magnetic Nanoparticles at Low Temperature

ZHANG Mao-Run, SUN Jing-Jing, CHEN Jing

(School of Chemical Engineering, Anhui University of Science and Technology, Huainan 232001, China)

Received:2012-01-06 Revised:2012-03-31 Published:2012-11-20 Online:2012-10-25
Supported by:
Natural Science Foundation of Anhui Provincial Education Department (2006Kj143B)

摘要/Abstract

摘要： 采用共沉淀–相转化法制备了纳米Dy_0.15Fe_1.85O₃磁颗粒, 研究了低温条件下温度变化对其磁学特性的影响. 采用XRF、TEM、XRD和超导量子磁强计(SQUID)对样品的化学成份、形貌、晶型结构和磁学性能进行了表征. 结果表明: 样品中的金属离子主要是Dy³⁺、Fe³⁺, 含量分别为12.17wt%、51.88wt%. 形貌为类球形, 平均粒径约15 nm, 且结晶性完全, 晶型为面心立方尖晶石结构. 在56.5～200.2 K范围内, 样品的饱和磁化强度(MS)、矫顽力(HC)均随温度的降低呈现出增大的变化规律, 当温度T≥142.8 K时, 呈超顺磁性状态; 当T＜142.8 K时, 由超顺磁性状态转化为铁磁性状态.

关键词: 纳米磁颗粒, 共沉淀–相转化法, 磁学特性, 低温

Abstract: Dy_0.15Fe_1.85O₃ magnetic nanoparticles were prepared by coprecipitation-phase transfer method, and the effect of temperature variation on the magnetic properties of the nanoparticles at low temperature were investigated. The chemical composition, morphology, crystalline structure and magnetic properties of the samples at low temperature were characterized by X-ray fluorescence spectrometer(XRF), transmission electron microscope (TEM), X-ray diffraction (XRD) and super-conducting quantum magnetometer (SQUID). The results show that metal ions in the sample are mainly Dy³⁺ and Fe³⁺ whose mass fractions are 12.17% and 51.88%, respectively. The average diameter of the samples is ca. 15 nm. The magnetic particles are spherical with face-centered cubic spinel structure and complete crystalline. The saturation magnetization (MS) and coercivity (HC) of the samples increase with the decrease of temperature in the range of 56.5 K and 200.2 K. When the temperature exceeds or is equal to 142.8 K, the magnetic properties of the samples is at the superparamagnetic state. While the temperature is below 142.8 K, the superparamagnetic state is converted to ferromagnetic state.

Key words: magnetic nanoparticles, coprecipitation-phase transfer method, magnetic properties, low temperature

中图分类号:

O654

张茂润, 孙静静, 陈静. 纳米Dy_0.15Fe_1.85O₃磁颗粒的低温磁特性研究[J]. 无机材料学报, 2012, 27(11): 1174-1178.

ZHANG Mao-Run, SUN Jing-Jing, CHEN Jing. Study on Magnetic Properties of Dy_0.15Fe_1.85O₃ Magnetic Nanoparticles at Low Temperature[J]. Journal of Inorganic Materials, 2012, 27(11): 1174-1178.

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纳米Dy_0.15Fe_1.85O₃磁颗粒的低温磁特性研究

Study on Magnetic Properties of Dy_0.15Fe_1.85O₃ Magnetic Nanoparticles at Low Temperature

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