Use of rare earth element bismuth (Pm)
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’·(Pm)
é’· (Pm) In 1947, JA Marinsky, LEGlendenin, and CECoryell successfully separated element 61 from uranium fuel used in nuclear reactors, in Greek mythology. The name Prometheus is named Promethium.äººé€ is an artificial radioactive element produced by a nuclear reactor.
The main uses of cockroaches are:
(1) Can be used as a heat source. Provides auxiliary energy for vacuum detection and satellites.
(2) Pm147 emits low-energy beta rays and is used to manufacture tantalum batteries. As a power source for missile guidance instruments and watches. This type of battery is small and can be used continuously for several years. In addition, helium is also used in portable X-rays, in the preparation of phosphors, in the measurement of thickness and in beacon lights.
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