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五十年代末期,人们开始发现了稀土族的一些元素与3d过渡族元素形成的某些金属化合物,具有优越的磁特性。大约十年以后,以稀土元素钐(Sm)与3d过渡族元素钴(CO)形成的SmCo_5永磁材料就以其优异的磁特性跃居永磁材料的显要地位。据最近报导,SmCo_5永磁材料的性能已达B_r=11000高斯,H_c=7000奥斯特,(BH)_(max)=30×10~6高斯·奥斯特。这比我们大量应用的Alnico系永磁材料B_r=10300高斯、从H_c=1705奥斯特、(BH)_(max)=12.2×10~6高·奥这样的性能,显然是一个很大的突破。我国具有丰富的稀土资源,因此开展这类研究工作就更有现实的意义。
The late fifties, people began to discover some of the rare earth elements and 3d transition elements of certain metal compounds formed, with superior magnetic properties. About a decade later, SmCo_5 permanent magnet material, which is made of rare earth element samarium (Sm) and 3d transition group element cobalt (CO), leaps to the forefront of permanent magnet materials with its excellent magnetic properties. It has recently been reported that the properties of SmCo_5 permanent magnetic materials have reached B o = 11000 Gauss, H_c = 7000 Oersteds, (BH) _ (max) = 30 × 10 -6 Gauss Osters. This is much larger than the Alnico permanent magnet material B_r = 10300 Gauss which is widely used in our field. From Hc = 1705 Oerstedt, (BH) _ (max) = 12.2x10-6 Gauss, this performance is obviously a very large breakthrough. China is rich in rare earth resources, so carrying out such research work is more realistic significance.