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对于稀土金属和其化合物各方面的研究工作已有二十年的历史。在周期表中稀土或镧族元素占有原子序数从57至71的位置。在自然界中,它们总是在一起并通常伴随着钇(Y)。除钇以外,钪(Sc)与稀土元素有相似的外层电子组态,因此人们也将这两个元素列入稀土系。这样,稀土系中总计是十七个元素。不但它们的外层电子组态极为相同,稀土元素的原子半径相互之间的差别也极小。因此,这些元素的化学性质十分类似。早期难于使这些元素互相分离。因此很长一段时间阻碍了对这一系列金属和
It has been 20 years of research work on all aspects of rare earth metals and their compounds. In the periodic table rare earth or lanthanoid elements occupy the atomic number from 57 to 71 position. In nature, they are always together and often accompanied by yttrium (Y). In addition to yttrium, scandium (Sc) and rare earth elements have a similar outer electronic configuration, so people also included these two elements in the rare earth system. In this way, a total of seventeen elements in the rare earth system. Not only are their outer electron configurations very similar, the atomic radii of rare earth elements differ little from each other. Therefore, the chemical nature of these elements is very similar. It is difficult to separate these elements from each other early on. So a long time has hindered this series of metals and