最初制成的锔样本数量很少,肉眼仅仅可见。科学家利用其放射特性,辨认出锔元素。Louis Werner和Isadore Perlman在1947年于加州大学对镅-241进行中子撞击,首次制备了重30 µg的可观量氢氧化锔-242。[16][17][18] W. W. T. Crane、J. C. Wallmann和B. B. Cunningham在1950年制成了宏观量的氟化锔,其磁性和GdF3相似。这首次提供了实验证据,证明锔在其化合物中具+3氧化态。[16]1951年,科学家用钡还原氟化锔,唯一一次制成了金属态的锔。[19][20]
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