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Structural Stability and Magnetic Properties of the TbCu _{7} -Type SmCo _{x - 0.4} Ti _{0.4} (x = 5.0\hbox {\textendash }8.5) Alloys

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2 Author(s)
Jiang, Chengbao ; Sch. of Mater. Sci. & Eng., Beijing Univ. of Aeronaut. & Astronaut., Beijing, China ; Zan Yao

We have studied the composition dependence, thermal stability, long-term stability at 500°C, and magnetic properties of the nanostructural TbCu7-type (1:7) Sm-Co-Ti alloys. We prepared the SmCox-0.4Ti0.4 alloys with a wide composition range from x = 5.0 to x = 8.5 by high-energy ball-milling, followed by annealing at 700-1100°C for 2 h. After annealing at 700°C, the powders with x = 7.0-8.5 showed a single 1:7 structure, while the powders with x = 5.0-6.5 presented the 1:7 plus CaCu5-type (1:5) structure. At an annealing temperature higher than 800°C, a minor Th2Zn17-type (2:17) phase precipitated in the matrix of the 1:7 phase. Intrinsic coercivity iHc exhibits a maximum of 2.3 T at room temperature and 0.4 T at 500°C in the x = 7.0 samples annealed at 700°C. The temperature coefficient of iHc seems stable as the Sm/Co ratio changes from 1/6.5 to 1/7.5. The coercivity decreased with increasing annealing temperature Ta, from 2.3 T at Ta = 700°C to 1.3 T at Ta = 1100°C, which is mainly attributed to the grain growth from 35 nm for Ta = 700°C to 1 ¿m for Ta = 1100°C. After holding at 500°C for up to 360 h, the microstructure and magnetic properties of the 1:7-type nanograin alloys remained almost unchanged, indicating a structurally and magnetically long-term stabilization at the potential high-temperature application environment.

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Magnetics, IEEE Transactions on  (Volume:46 ,  Issue: 1 )