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稀土永磁材料RCO_5及R_2Co_(17)晶场系数的计算 被引量:1
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作者 张希海 张忠武 《河北师范大学学报(自然科学版)》 CAS 1989年第1期56-61,共6页
本文系统地计算了RCo_5、R_2Co_(17)(R为稀土元素)的晶场系数,并将所得的二阶项与J.E.Greedan和V.U.S.RAO的结果(他们只计算了二阶项)进行了比较.
关键词 永磁材料 rco5 R2CO17 晶场系数
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Correlation between valence electronic structure and magnetic properties in RCo_5(R=rare earth) intermetallic compound 被引量:4
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作者 薛智琴 郭永权 《Chinese Physics B》 SCIE EI CAS CSCD 2016年第6期165-171,共7页
The magnetisms of RCo5(R = rare earth) intermetallics are systematically studied with the empirical electron theory of solids and molecules(EET).The theoretical moments and Curie temperatures agree well with exper... The magnetisms of RCo5(R = rare earth) intermetallics are systematically studied with the empirical electron theory of solids and molecules(EET).The theoretical moments and Curie temperatures agree well with experimental ones.The calculated results show strong correlations between the valence electronic structure and the magnetic properties in RCo5 intermetallic compounds.The moments of RCo5 intermetallics originate mainly from the 3d electrons of Co atoms and 4f electrons of rare earth,and the s electrons also affect the magnetic moments by the hybridization of d and s electrons.It is found that moment of Co atom at 2c site is higher than that at 3g site due to the fact that the bonding effect between R and Co is associated with an electron transformation from 3d electrons into covalence electrons.In the heavy rare-earth-based RCo5 intermetallics,the contribution to magnetic moment originates from the 3d and 4f electrons.The covalence electrons and lattice electrons also affect the Curie temperature,which is proportional to the average moment along the various bonds. 展开更多
关键词 EET theory electronic structure Curie temperature rco5 intermetallics
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Low-cost Sm0.7Y0.3Co5 sintered magnet produced by traditional powder metallurgical techniques 被引量:1
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作者 Dong-Tao Zhang Nai-Xing Cai +2 位作者 Rong-Chun Zhu Wei-Qiang Liu Ming Yue 《Rare Metals》 SCIE EI CAS CSCD 2020年第4期421-428,共8页
RCo5(R=rare earth)sintered magnets have good temperature stability,so it is still widely used in high temperature field.In this paper,by the method of adding liquid phase SmCo1.7 to the main phase,Sm0.7Y0.3Co5 magnet ... RCo5(R=rare earth)sintered magnets have good temperature stability,so it is still widely used in high temperature field.In this paper,by the method of adding liquid phase SmCo1.7 to the main phase,Sm0.7Y0.3Co5 magnet was prepared by traditional powder metallurgical process.The results show the presence of a main phase RCo5,a minor phase R2 Co7,and a R-rich phase in the magnet.Contrasting the results of the XRD(X-ray diffraction)in random and oriented directions,the magnet has a well-aligned(00l)orientated texture,which is consistent with the result of the electron backscattered diffraction(EBSD).The Sm0.7Y0.3Co5 sintered magnet has good magnetic properties as remanence(Br)is 0.96 T,the coercivity(Hcj)is 1201.96 kA·m-1,and maximum magnetic energy product((BH)max)is 175.16 kJ m-3. 展开更多
关键词 Sm0.7Y0.3Co5 Sintered magnets LOW-COST Magnetic properties rco5
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