Optimizing the magnetic properties of Ce-containing Nd–Fe–B sintered magnets with La substitution

Strategy for Co‐Enhancement of Remanence–Coercivity of RE‐Fe‐B Sintered Magnets with High Ce‐Content: Appropriate La Substitution

“…[ 21 , 22 ] Meanwhile, the production of the CeFe 2 phase will consume Ce and Fe elements, leading to a reduction of the RE 2 Fe 14 B phase in the magnet, which is also detrimental to magnetic properties. [ 16 , 23 , 24 ] In addition, the paramagnetic CeFe 2 phase with large block aggregation distribution can increase the local demagnetization field, leading to a reduction of the nucleation field. Unfortunately, CeFe 2 phases also occupy considerable amount of Fe, which will increase the Fe content of lamellar grain boundary (GB) decreasing the effect of suppressing magnetic coupling between grains and leading to a significant decrease in H cj .…”

Accelerated discovery of cost-effective Nd–Fe–B magnets through adaptive learning

“…2 As a result, doping of La/ Ce invariably leads to degraded magnetic properties, especially at HT. [22][23][24][25][26][27][28][29] Co, with a very high T C , could signicantly improve the temperature stability and therefore benet HT magnetic properties, although it results in loss of RT magnetic properties as well. 21,[30][31][32][33] In recent years, investigation of Y as a promising doping species for Nd-Fe-B has picked up momentum.…”

“…Finding the optimal composition in an efficient manner is highly challenging for a conventional trial-and-error and/or intuition-based approach, due to the vast number of potential combinations in this 5-dimensional composition space. And this is further compounded by the non-linear manner in which the above doping species tend to affect the magnetic properties individually, as well as the complex interaction (for example, reported synergistic effects between La and Ce, 26,30,42 Ce and Y, 35 Ce and Co, 22 etc. ) among species.…”