The role of metal Gd and metal Ho replacing Nd

Among the heavy rare earth metals, Gd has the highest reserves, and Gd can also form Gd2Fe14B compounds. The magnetic polarization intensity Js and anisotropic field HA of this compound are obviously lower, but its Curie temperature Tc is the highest. Due to the high reserves of Gd and the low price, some manufacturers add Gd in the form of gadolinium-iron alloy to partially replace Nd to produce low-cost sintered NdFeB. However, its practical use of Gd to replace Nd is a waste. Once it is discovered that Gd has more important uses in the future, it will be found to be an irreversible loss. Substituting Ho for Nd has the same effects and problems.