稀土 磁铁是由合金制成的强力永磁体。 稀土元素. Developed in the 1970s and 1980s, the most common types are neodymium magnets (NdFeB) and samarium–cobalt magnets (SmCo). They are the strongest type of permanent magnets made, producing significantly stronger magnetic fields than ferrite or alnico magnets, enabling miniaturization and improved performance in many 技术. Note: the term ‘rare-earth element’ is a historical misnomer. These elements are not exceptionally rare in the Earth’s crust. Cerium, the most abundant, is the 25th most abundant element, similar to copper. Even the least abundant stable 稀土, lutetium, is nearly 200 times more common than gold. The ‘rare’ label arose because they were difficult to separate.





