| 锂铁氧体纳米晶磁性的研究 |
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| 引用本文： | 杨桦,赵慕愚,韩德华,王建平,罗河烈.锂铁氧体纳米晶磁性的研究[J].物理学报,1996,45(2):291-296. |
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| 作者姓名： | 杨桦 赵慕愚 韩德华 王建平 罗河烈 |
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| 作者单位： | (1)吉林大学化学系,长春130023; (2)中国科学院物理研究所,北京100080 |
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| 摘 要： | 研究了颗粒平均直径由9.1—860nm范围的锂铁氧体纳米晶的磁性.它们的比饱和磁化强度σs随其颗粒尺寸减小而线性减小.测量了样品A(颗粒直径为D=860nm),样品B(D=11.8nm)和样品C(D=9.1nm)的比饱和磁化强度随温度的变化曲线σ(T)和穆斯堡尔谱.发现样品B和C的居里温度比样品A的低50℃.从样品C的σ(T)曲线看,样品C好像由二种磁相所构成.利用超顺磁和表面磁性讨论了样品C的特异磁性.
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| 关 键 词： | 锂 铁氧体 纳米晶 磁性 |
| 收稿时间： | 1994-10-20 |
A STUDY ON THE MAGNETIC PROPERTIES OF THE LITHIUM FERRITE NANOCRYSTALLITES |
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| YANG HUA,ZHAO MU-YU,HAN DE-HUA,WANG JIAN-PING and LUO HE-LIE.A STUDY ON THE MAGNETIC PROPERTIES OF THE LITHIUM FERRITE NANOCRYSTALLITES[J].Acta Physica Sinica,1996,45(2):291-296. |
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| Authors: | YANG HUA ZHAO MU-YU HAN DE-HUA WANG JIAN-PING and LUO HE-LIE |
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| Abstract: | The magnetic properties of lithium ferrite nanocrystallites ranging from 9.1 to 860 nm have been studied. The specific saturation magnetization σs of these nanocrystallites decrease lineally with the nanocrystallite size.The specific magnetization versus temperature curves (T) and M?ssbauer spectra of sample A (diameter D = 860 nm), sample B (D = 11.8 nm) and sample C (D = 9.1 nm) have been measured. It is found that the Curie temperatures of samples B and C are 50℃ lower than that of sample A. From the σ(T) curve of sample C, it seems that sample C consists of two magnetic phases. These phenomena have been discussed with the superparamagnetism and the surface magnetism of sample C.
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