熔体快淬La1-xCex(Fe0.92Co0.08)11.4Si1.6合金的结构和大磁熵变

材料研究学报

2012, Vol. 26

Issue (5): 511-514

研究论文

本期目录 | 过刊浏览

熔体快淬La_1-xCe_x(Fe_0.92Co_0.08)_11.4Si_1.6合金的结构和大磁熵变

高贝贝, 钟喜春, 郑志刚, 刘仲武, 曾德长

华南理工大学材料科学与工程学院广州 510640

Structure and Large Magnetic Entropy Change of Melt-Spun La_1−xCe_x(Fe_0.92Co_0.08)_11.4Si_1.6 Alloys

GAO Beibei, ZHONG Xichun, ZHENG Zhigang, LIU Zhongwu, ZENG Dechang

School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640

引用本文:

高贝贝钟喜春郑志刚刘仲武曾德长. 熔体快淬La_1-xCe_x(Fe_0.92Co_0.08)_11.4Si_1.6合金的结构和大磁熵变[J]. 材料研究学报, 2012, 26(5): 511-514.
GAO Beibei ZHONG Xichun ZHENG Zhigang LIU Zhongwu ZENG Dechang. Structure and Large Magnetic Entropy Change of Melt-Spun La_1−xCe_x(Fe_0.92Co_0.08)_11.4Si_1.6 Alloys[J]. Chinese Journal of Materials Research, 2012, 26(5): 511-514.

全文: PDF(994 KB)

摘要:

用熔体快淬法制备La_1-xCe_x(Fe_0.92Co_0.08)11.4Si1.6(x=0, 0.1, 0.3, 0.5)合金, 通过X射线衍射和磁性能测量研究了退火态(1000℃、3 h)La_1-xCe_x(Fe_0.92Co_0.08)_11.4Si_1.6的相组成和磁熵变。结果表明, 以Ce部分替代La使La_1-xCe_x(Fe_0.92Co_0.08)_11.4Si_1.6合金更易形成NaZn₁₃型立方结构相、α--Fe相的含量显著减少, 居里温度有一定程度地降低, 磁熵变有较大幅度的增加。但是, 当Ce替代量增加到0.5时出现杂相, 磁熵变反而降低。La_1-xCe_x(Fe_0.92Co_0.08)_11.4Si_1.6(x=0.3)合金在室温附近的最大等温磁熵变比纯Gd的还大, 有望成为低成本、高性能的室温磁致冷材料。

关键词 ：金属材料, 磁致冷材料, 熔体快淬, La1-xCex(Fe0.92Co0.08)11.4Si1.6合金, 磁熵变

Abstract：

La1−xCex(Fe0.92Co0.08)11.4Si1.6 (x=0, 0.1, 0.3, 0.5) alloys were prepared by arc meltspinning. The structure and magnetic entropy change of annealed La1−xCex(Fe0.92Co0.08)11.4Si1.6 alloys (1000℃ for 3 h) were investigated using by X-ray diffraction (XRD) and magnetic properties. The results show that partial substitution of Ce for La in La1−xCex(Fe0.92Co0.08)11.4Si1.6 (x=0, 0.1, 0.3, 0.5) alloys, the cubic NaZn13-type structure phase is more easily formed, α–Fe phase is significantly reduced, Curie temperature is reduced to some extent, and the magnetic entropy change increases greatly. However the impurity phases appear when Ce substitution is up to 0.5, the magnetic entropy change decreases. The maximum isothermal magnetic entropy change of La1−xCex(Fe0.92Co0.08)11.4Si1.6 alloy with x=0.3 near room temperature is superior to that of Gd, suggesting that La1−xCex(Fe0.92Co0.08)11.4Si1.6 alloy with x=0.3 is promising to be low-cost, high efficiency magnetic refrigeration materials at room temperature.

Key words： metallic materials magnetic refrigeration material melt-spun La1−xCex(Fe0.92Co0.08)11.4Si1.6 alloy, magnetic entropy change

收稿日期: 2012-06-18

ZTFLH:

O482

基金资助:

国家自然科学基金(U0734001, 50874050), 广东省科技计划(2010B050300008, 2010A090200042, 2009B090300273), 广州市科技计划12F582080022和中央高校基本科研业务费专项资金(2012ZZ0013, 2011ZM0014)资助项目。

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