Experimental study demonstrates improved magnetic performance in spark-plasma-sintered lanthanum-cerium magnets, highlighting a route to reduce reliance on critical rare-earth elements.
La substitution for Ce inhibits the growth of the CeFe2phase and promotes the formation of the single 2:14:1 phase, leading to an improvement in the magnetic properties of melt-spun (La/Ce)3Fe14B ribbons. Among which, the (La0.3Ce0.7)3Fe14B ribbon produced a high remanence of 6.86 kG, a coercivity of 5.51 kOe, and a maximum energy product (BH)max of 7.68 MGOe. After spark plasma sintering, the compacted (La0.3Ce0.7)3Fe14B magnet with good remanence and coercivity was successfully prepared, and these properties were enhanced to 5.14 kG and 5.60 kOe, respectively, leading to an energy product of 4.59 MGOe for the magnet with 5 wt % NdCu addition.
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Lu et al. (2017) studied this question.
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