Rare-earth elements have received a great deal attention due to wide application in luminescent materials, laser materials, permanent-magnet materials, magnetic refrigeration materials, magnetostrictive materials, hydrogen storage materials, high temperature superconductor and other high technology fields. 稀土元素广泛地应用于发光材料、激光材料、永磁材料、磁致冷材料、磁致伸缩材料、储氢材料、高温超导材料等高技术领域,已经引起了广泛的重视。