热处理条件对BaSm0.3Fe11.7O19铁氧体纤维结构演化和磁性能的影响

高等学校化学学报 ›› 2011, Vol. 32 ›› Issue (8): 1697.

热处理条件对BaSm0.3Fe11.7O19铁氧体纤维结构演化和磁性能的影响

孟献丰, 王云龙, 沈湘黔

江苏大学材料科学与工程学院, 镇江 212013

收稿日期:2010-10-22 修回日期:2011-05-22 出版日期:2011-08-10 发布日期:2011-07-19
通讯作者: 孟献丰 E-mail:mxf2029@ujs.edu.cn
基金资助:
国家自然科学基金(批准号: S0674048)和中国博士后科学基金(批准号: 20080431069)资助.

Effects of Heat-treatment Condition on Structure and Magnetic Properties of BaSm0.3Fe11.7O19 Ferrite Fibers

MENG Xian-Feng*, WANG Yun-Long, SHEN Xiang-Qian

School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China

Received:2010-10-22 Revised:2011-05-22 Online:2011-08-10 Published:2011-07-19
Contact: MENG Xian-Feng E-mail:mxf2029@ujs.edu.cn
Supported by:
国家自然科学基金(批准号: S0674048)和中国博士后科学基金(批准号: 20080431069)资助.

摘要/Abstract

摘要： 以金属盐和柠檬酸为原料，采用溶胶凝胶法成功制备1μm以下具有较大长径比的纳米晶BaSm0.3Fe11.7O19 铁氧体纤维。采用热重-差热分析(TG-DSC)、X射线衍射仪(XRD)、场发射扫描电镜(FE-SEM)和振动样品磁强计(VSM)对前躯体纤维及其焙烧产物进行了表征。实验结果表明，750℃焙烧1小时，BaSm0.3Fe11.7O19铁氧体相已基本形成，随着焙烧温度的升高和保温时间的延长，BaSm0.3Fe11.7O19晶粒尺寸逐渐增大，纤维表面越发粗糙，片状结构越发明显。同时，纤维的饱和磁化强度(Ms)随晶粒尺寸的增加而增大，而矫顽力(Hc)则呈现先增大后减小的趋势，在晶粒尺寸为58.4 nm附近达到最大值459.2 kA/m，这表明Sm0.3Fe11.7O19纤维的临界单畴尺寸在60nm左右。对低温(77K)和室温(300K)样品的磁性能比较发现，磁性能存在明显的差异，这主要与纳米晶的表面自旋有关。

关键词: 热处理, BaSm0.3Fe11.7O19 铁氧体, 纤维, 磁性能

Abstract: The BaSm0.3Fe11.7O19 ferrite fibers with diameters below 1μm were successfully fabricated by sol-gel method from starting reagents of metal salts and citric acid. The precursor and calcined products were characterized by means of thermogravimetric and differential thermal analysis (TG-DSC), X-ray powder diffraction (XRD), field emission scanning electron microscopy (FE-SEM) and vibrating sample magnetometer (VSM). The results showed that the pure BaSm0.3Fe11.7O19 ferrite phase was basically formed after calcined at 750 ℃ for 1 h. With the increase of calcination temperature and holding time, the grain growth take place, the fiber surface became much rougher and plate structure become more and more obvious. At the same time, the saturation magnetization (Ms) of BaSm0.3Fe11.7O19 ferrite fibers monotonously increased, while the coercivity (Hc) initially increased, reached a maximum value of 459.2 kA/m at grain size of 58.4 nm, and then decreased with further grain growth, indicating that the single-domain critical size of BaSm0.3Fe11.7O19 ferrite fibers may be around 60 nm. The difference of Ms and Hc measured at 300K and 77K are attributed to the surface spin order nanocrystalline BaSm0.3Fe11.7O19 ferrite.

Key words: Heat-treatment, BaSm0.3Fe11.7O19 ferrite, Fiber, Magnetic property

中图分类号:

TQ174

TrendMD:

孟献丰王云龙沈湘黔. 热处理条件对BaSm0.3Fe11.7O19铁氧体纤维结构演化和磁性能的影响. 高等学校化学学报, 2011, 32(8): 1697.

MENG Xian-Feng*, WANG Yun-Long, SHEN Xiang-Qian. Effects of Heat-treatment Condition on Structure and Magnetic Properties of BaSm0.3Fe11.7O19 Ferrite Fibers. Chem. J. Chinese Universities, 2011, 32(8): 1697.

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