Rationally selecting the chemical composition of the Nd–Fe–B magnet for high-efficiency grain boundary diffusion of heavy rare earths
Jiayi He, Zhigao Yu, Jiali Cao, Wenyue Song, Ke Xu, Wenbing Fan, Hongya Yu, Xichun Zhong, Huayun Mao, Congyao Mao, Liu Hon
Abstract
Higher diffusion efficiency of Tb was found in Nd–Fe–B than in Pr–Nd–Fe–B sintered magnets. This is because the reactive Pr brings more intergranular oxides, which blocks the diffusion channel for Tb and consumes Tb at the triple-junction phase.
Topics & Concepts
Materials scienceDiffusionMagnetGrain boundaryIntergranular corrosionChemical compositionGrain boundary diffusion coefficientPhase (matter)MetallurgyAnalytical Chemistry (journal)MicrostructureThermodynamicsChemistryElectrical engineeringEnvironmental chemistryOrganic chemistryPhysicsEngineeringMagnetic Properties of AlloysHydrogen Storage and MaterialsMagnetic properties of thin films