Classification of rare earths
1) Light rare earth (also known as 铈 group): 镧 , 铈, 镨 , é’• , é’·, é’ , é“• , é’† .
2) Heavy rare earth (also known as é’‡ group): 铽 , é• , é’¬ , é“’ , é“¥ , 镱 , é•¥ , é’ª , é’‡.
The difference between the 铈 group and the 钇 group is because the rare earth mixture obtained by separation of minerals is often named after the ratio of lanthanum or cerium.
Rare earth metals (rare earth metals), also known as a rare earth element, is a general term for a group â…¢B periodic table scandium, yttrium, lanthanides 17 elements, commonly represented by R or RE. Their names and chemical symbols are é’ª (Sc), é’‡ (Y), 镧 (La), 铈 (Ce), 镨 (Pr), é’• (Nd), é’· (Pm), é’ (Sm), é“• (Eu ), Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu. Their atomic numbers are 21 (Sc), 39 (Y), 57 (La) to 71 (Lu).
é’(Sm)
In 1879, Beuys package Dresser discovered a new rare earth element yttrium niobium ore from the resulting "praseodymium neodymium", the samarium and named based on the name of this ore.
Samarium pale yellow, raw material is samarium cobalt permanent magnets, the first magnet is a samarium cobalt rare earth magnets obtained in industrial applications. Such permanent magnets are of the SmCo 5 type and the Sm 2 Co 17 type . In the early 1970s, the SmCo 5 series was invented, and the Sm 2 Co 17 series was invented later. Now it is based on the needs of the latter. The purity of cerium oxide used in samarium-cobalt magnets does not need to be too high, and from the viewpoint of cost, about 95% of products are mainly used. In addition, yttrium oxide is also used in ceramic capacitors and catalysts. In addition, niobium also has a nuclear nature, which can be used as a structural material for atomic energy reactors, screen materials and control materials to make nuclear fission generate huge energy for safe use.
Metal enamel
Yttrium oxide
Barium nitrate
Samarium cobalt magnet
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