Use of rare earth element lanthanum (Eu)
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“• (Eu) In 1901, Eugene-Antole Demarcay discovered a new element from the é’, named Europium.
é“• (Eu) application
Most of cerium oxide is used in phosphors. Eu 3 + is used as an activator for red phosphors and Eu 2 + is used for blue phosphors. Now Y 2 O 2 S: Eu 3 + is the best phosphor for luminous efficiency, coating stability, and recovery cost. In addition, improvements in technologies such as improved luminous efficiency and contrast are being widely used. In recent years, cerium oxide has also been used in stimulated emission phosphors of new X-ray medical diagnostic systems. Cerium oxide can also be used to make colored lenses and optical filters for use in magnetic bubble storage devices, and can also be used in control materials, screen materials and structural materials for atomic reactors.
Color phosphors are yttrium activated yttrium oxide
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Yttrium oxide
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