Structure, magnetic properties, and thermal stability of Sm1−xTmxCo5 compounds
Structure, magnetic properties, and thermal stability of Sm1−xTmxCo5 compounds
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DOI：
10.1007/s12598-014-0232-4
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发表时间：
2014-03
期刊：
影响因子：
8.8
通讯作者：
J. Zuo;M. Yue;Q. Lu;Dongtao Zhang;Xuexu Gao;Jiuxing Zhang;Zhao-Hui Guo;W. Li
中科院分区：
文献类型：
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作者：
J. Zuo;M. Yue;Q. Lu;Dongtao Zhang;Xuexu Gao;Jiuxing Zhang;Zhao-Hui Guo;W. Li
通过X射线衍射、热磁分析和磁测量研究了Sm1-−-xTmxCo5三元化合物的结构、磁性和热稳定性。X射线衍射结果表明，所有化合物的主相均为六方CaCu5型晶体结构，并含有少量的杂质相；Tm含量的增加与六方晶胞沿晶轴方向的收缩和a、b参数的膨胀有关。热重分析结果表明，Sm1−xTmxCo5化合物的居里温度(TC)随Tm含量的增加而升高。磁性测量表明，随着Tm含量的增加，样品的磁各向异性场(HA)和外加磁场(M7T)的磁化强度都减小。然而，所有Tm掺杂化合物的热稳定性都比纯SmCo5化合物有显著的提高，导致Sm0.8Tm0.2Co5.2的M7和HA值在473K都高于SmCo5化合物，这表明Tm掺杂化合物在高温下具有良好的实际应用潜力。
Structure, magnetic properties, and thermal stability of ternary Sm1−xTmxCo5compounds were studied via X-ray diffraction (XRD), thermal magnetic analysis (TMA), and magnetic measurements. XRD results show that all the compounds have a main phase of hexagonal CaCu5-type crystal structure with small amount of impurity phases; increasing Tm content is associated with contraction of the hexagonal unit cell in the direction of thecaxis and expansion of theaandbparameters. TMA results indicate that the Curie temperature (TC) of Sm1−xTmxCo5compounds gets higher with the increase in Tm content. Magnetic measurements show that both the magnetic anisotropy field (HA) and the magnetization at an applied field of 7 T (M7 T) decrease with the increase of Tm content. However, the thermal stability of both theHAandM7 Tof all the Tm doped compounds is remarkably improved compared with that of the pure SmCo5compound, leading to the result that both theM7 TandHAof Sm0.8Tm0.2Co5.2are higher than those of SmCo5compound at 473 K, which indicates the good potential of Tm doped compound in the practical applications at elevated temperature.