Haider Syed Kamran, Ngo Hieu Minh, Kim Dongsoo, Kang Young Soo
Department of Chemistry, Sogang University, 35, Baekbeomro, Mapogu, Seoul, 04107, South Korea.
Powder and Ceramics Division, Korea Institute of Materials Science, Changwon, Gyeongnam, 51508, South Korea.
Sci Rep. 2021 May 12;11(1):10063. doi: 10.1038/s41598-021-89331-z.
SmCo and SmCoCu magnetic particles were produced by co-precipitation followed by reduction diffusion. HRTEM confirmed the Cu substitution in the SmCo lattice. Non-magnetic Cu was substituted at "2c" site in the SmCo crystal lattice and effectively stopped the coupling in its surroundings. This decoupling effect decreased magnetic moment from SmCo (12.86 μ) to SmCoCu (10.58 μ) and SmCoCu (7.79 μ) and enhanced anisotropy energy from SmCo (10.87 Mega erg/cm) to SmCoCu (14.05 Mega erg/cm) and SmCoCu (14.78 Mega erg/cm). Enhancement of the anisotropy energy increased the coercivity as its values for SmCo, SmCoCu and SmCoCu were recorded as 4.5, 5.97 and 6.99 kOe respectively. Being six times cheaper as compared to Co, substituted Cu reduced the price of SmCoCu up to 2%. Extra 15% Co was added which not only enhanced the M value but also reduced the 5% of the total cost because of additional weight added to the SmCoCu. Method reported in this work is most energy efficient method on the synthesis of Sm-Co-Cu ternary alloys until now.
通过共沉淀后还原扩散制备了SmCo和SmCoCu磁性颗粒。高分辨率透射电子显微镜（HRTEM）证实了Cu在SmCo晶格中的取代。非磁性Cu取代了SmCo晶格中的“2c”位点，并有效地阻止了其周围的耦合。这种解耦效应使磁矩从SmCo（12.86 μ）降至SmCoCu（10.58 μ）和SmCoCu（7.79 μ），并使各向异性能量从SmCo（10.87兆尔格/平方厘米）提高到SmCoCu（14.05兆尔格/平方厘米）和SmCoCu（14.78兆尔格/平方厘米）。各向异性能量的增加提高了矫顽力，SmCo、SmCoCu和SmCoCu的矫顽力值分别记录为4.5、5.97和6.99 kOe。与Co相比便宜六倍的取代Cu使SmCoCu的价格降低了2%。添加了额外15%的Co，这不仅提高了M值，还由于添加到SmCoCu中的额外重量而降低了总成本的5%。本文报道的方法是迄今为止合成Sm-Co-Cu三元合金最节能的方法。
