A dynamic observation on the Sm (Co, Cu, Fe, Zr)_(7.4) permanent magnetic alloy with a 1000 kV HVEM and a study on the effect of Zr by Mossbauer effect are carried out. The magnetic property of the above magnets by po...A dynamic observation on the Sm (Co, Cu, Fe, Zr)_(7.4) permanent magnetic alloy with a 1000 kV HVEM and a study on the effect of Zr by Mossbauer effect are carried out. The magnetic property of the above magnets by powder metallurgy is Br=1.12 T, _iH_c=1078 kA/m, (BH)_(max)=243.6 kJ/m^3. It is found that the centers of the cellular structure. which plays an important role for _iH_c, form at 460℃ and grow up during 5000℃ to 700℃. The intrinsic coercivity of the alloy rises up with the gradual perfection, the size and amount increment of cellular structure. The Mossbauer experiment showed the addition of Zr induced atoms to enter into 2:17 phase from 1:5 phase, which raised the content and magnetic difference of the two phases. Adding Zr speeded up Fe atom to move to Co_3 crystal position from Co_1 position, hence raised the single-axis anisotropy of the alloy. The two effects are both beneficial for the rise of _iH_c.展开更多
基金Project supported by the State Key Laboratory of Magnetism Institute of Physics, Academia Sinica.
文摘A dynamic observation on the Sm (Co, Cu, Fe, Zr)_(7.4) permanent magnetic alloy with a 1000 kV HVEM and a study on the effect of Zr by Mossbauer effect are carried out. The magnetic property of the above magnets by powder metallurgy is Br=1.12 T, _iH_c=1078 kA/m, (BH)_(max)=243.6 kJ/m^3. It is found that the centers of the cellular structure. which plays an important role for _iH_c, form at 460℃ and grow up during 5000℃ to 700℃. The intrinsic coercivity of the alloy rises up with the gradual perfection, the size and amount increment of cellular structure. The Mossbauer experiment showed the addition of Zr induced atoms to enter into 2:17 phase from 1:5 phase, which raised the content and magnetic difference of the two phases. Adding Zr speeded up Fe atom to move to Co_3 crystal position from Co_1 position, hence raised the single-axis anisotropy of the alloy. The two effects are both beneficial for the rise of _iH_c.
