Tm元素对SmCo_5晶体结构与磁性能的影响（英文）

Influence of Tm on Crystal Structure and Magnetic Properties of SmCo_5 Compounds

采用X射线衍射分析(XRD)和磁性能测试等方法,分析了Tm元素掺杂对Sm Co5晶体结构和内禀磁性能的影响。XRD测试结果表明:Sm Co5和Sm0.8Tm0.2Co5.2均为Ca Cu5结构,掺杂Tm元素后,晶格常数c值增大,而a,b与晶胞体积减小;M-T曲线测试结果表明:Sm Co5和Sm0.8Tm0.2Co5.2的居里温度分别为957和965 K;在测试外加场为7 T的条件下,300 K时Sm Co5的各向异性场HA和饱和磁化强度M7T均高于Sm0.8Tm0.2Co5.2;当温度升高至473 K,Sm Co5的HA和M7T要低于Sm0.8Tm0.2Co5.2,说明Sm Co5中进行Tm元素掺杂可以有效的改善其在高温条件下的磁性能。

The compounds of SmCo5 and Sm0.5Tm0.2Co5.2 have been studied via X-ray diffxaction （XRD） and magnetic measurements, in order to clarify the effect of Tm doping on the crystal structure and intrinsic magnetic properties of the SmCos compound. XRD results show that both compounds have a single hexagonal CaCu5 type crystal structure, and the Tm doping leads to an expansion of the hexagonal unit cell in the direction of c axis and a contraction of a, b axes and the cell volume. The Curie temperatures （Tc） of the SmCo5 and Sm0.8Tm0.2Co5.2 are 957 and 965 K, respectively. Magnetic measurements show that both the magnetic anisotropy field （HA） and the magnetization at an applied field of 7 T （MTT） of SmCo5 are higher than those of Sm0.8Tm0.2Co5.2 at room temperature （300 K）. However, the HA and MTT of SrnCo5 become lower than those of Sm0.8Tm0.2Co5.2 with the temperature increasing to 473 K. Therefore, it is concluded that Tm doping in SmCo5 can effectively improve the magnetic properties at elevated temperature.