비자성상 첨가에 의한 ThMn<SUB>12</SUB> 구조의 철계 자성합금의 자기적 특성 향상

다국어 초록 (Multilingual Abstract)

Recently, Fe-rich alloys with ThMn12 structure have attracted much attention as next generation permanent magnet materials. Among them, Sm(Fe<SUB>0.8</SUB>Co<SUB>0.2</SUB>)<SUB>11</SUB>Ti alloy shows good magnetic properties, however the low coercivity problem is still to be solved. In order to improve the coercivity, Sm(Fe<SUB>0.8</SUB>Co<SUB>0.2</SUB>)<SUB>11</SUB>Ti bulk samples were prepared by adding non-magnetic Sm<SUB>7</SUB>Cu₃ powders (0, 5, and 10 wt%). The crystallographic and magnetic properties of Sm(Fe<SUB>0.8</SUB>Co<SUB>0.2</SUB>)<SUB>11</SUB>Ti added Sm7Cu₃ have been investigated by using X-ray
diffractometer (XRD), scaning electron microscope (SEM), and vibrating sample magnetometer (VSM). The phase identity and volume fraction of Sm(Fe<SUB>0.8</SUB>Co<SUB>0.2</SUB>)<SUB>11</SUB>Ti powders were determined by using Rietveld refinement. The phase distribution of grains and grain boundaries was analyzed by using SEM. With increasing Sm<SUB>7</SUB>Cu₃ content, the value of saturation magnetization of Sm(Fe<SUB>0.8</SUB>Co<SUB>0.2</SUB>)<SUB>11</SUB>Ti bulk samples decreased, while their coercivity increased by about 67% with an addition of a non-magnetic phase.