Use of rare earth element bismuth (Tb)

Classification of rare earths

1) Light rare earth (also known as é“ˆ group): é•§ , é“ˆ, é•¨ , é’• , é’·, é’ , é“• , é’† .

2) Heavy rare earth (also known as é’‡ group): é“½ , é• , é’¬ , é“’ , é“¥ , é•± , é•¥ , é’ª , é’‡.

The difference between the é“ˆ group and the é’‡ 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), é•§ (La), é“ˆ (Ce), é•¨ (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“½(Tb)

In 1843, Karl G. Mosander of Sweden discovered Terbium through a study of bauxite. Most of the applications of é“½ involve high-tech fields, are technology-intensive, knowledge-intensive and cutting-edge projects, and are projects with significant economic benefits, which have attractive development prospects.

The main application areas are:

Activator (1) phosphors for the three primary colors of green phosphor powder, such as terbium activated phosphate matrix, terbium-activated silicate matrix, terbium-activated cerium magnesium aluminate matrix, in the excited state Both emit green light.

(2) Magneto-optical storage materials. In recent years, lanthanide magneto-optical materials have reached the scale of mass production. Magneto-optical discs developed with Tb-Fe amorphous films are used as computer storage components, and the storage capacity is improved by 10 to 15 times.

(3) Magneto-optical glass, ytterbium-containing Faraday rotatory glass is a key material for the manufacture of rotators, isolators and circulators that are widely used in laser technology. Especially developed Terfenol alloy (TerFenol), but also opens up new uses terbium, Terfenol is a new material discovered in the 1970s, half of the alloy composition as terbium and dysprosium, holmium sometimes added, The rest is iron, which was first developed by the Arms Laboratory in Iowa, USA. When Terfenol is placed in a magnetic field, its dimensional change is larger than that of a typical magnetic material. This change allows some precision mechanical motion to be achieved. . NdFe began to be used primarily in sonar and is now used in a wide variety of applications, from fuel injection systems, liquid valve control, micro-positioning to mechanical actuators, mechanisms and aircraft wing telescope adjustment wing regulators.

High purity metal

Tb4O7

Alnico (the AlNiCo) a metal-based permanent magnet

Add a small amount of bismuth (Dy) metal material

Permanent magnet material, adding a small amount of é• ((Dy), é“½ (Tb), é“Œ (Nb), and other elements)

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