Use of rare earth element strontium (Dy)

Classification of rare earths

1) Light rare earth (also known as 铈 group): 镧 , 铈, 镨 , 钕 , 钷, 钐 , 铕 , 钆 .

2) Heavy rare earth (also known as 钇 group): 铽 , 镝 , 钬 , 铒 , 铥 , 镱 , 镥 , 钪 , 钇.

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 ⅢB periodic table scandium, yttrium, lanthanides 17 elements, commonly represented by R or RE. Their names and chemical symbols are 钪 (Sc), 钇 (Y), 镧 (La), 铈 (Ce), 镨 (Pr), 钕 (Nd), 钷 (Pm), 钐 (Sm), 铕 (Eu ), Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu. Their atomic numbers are 21 (Sc), 39 (Y), 57 (La) to 71 (Lu).

镝(Dy)

In 1886, the Frenchman Pois Baudler succeeded in separating the cockroach into two elements, one still called 钬, and the other named dysprosium according to the meaning of "hard to get" from 钬.镝 is currently playing an increasingly important role in many high-tech fields.

The main uses of cockroaches are:

(1) as an additive neodymium iron boron permanent magnets, which magnets adding about 2 to 3% of dysprosium, coercivity can be improved, the demand for small dysprosium past, but with NdFeB magnets As demand increases, it becomes a necessary addition element, the grade must be around 95 to 99.9%, and demand is rapidly increasing.

(2) 镝 is used as a phosphor activator. Trivalent cerium is a promising active ion of a single luminescent center trichromatic luminescent material. It is mainly composed of two emission bands, one for yellow emission and the other for blue light. The emitted, erbium-doped luminescent material can be used as a trichromatic phosphor.

(3) Niobium is an essential metal material for the preparation of a large magnetostrictive alloy, Terfenol alloy, which enables the precise movement of some mechanical movements.

(4) Base metal can be used as a magneto-optical storage material with high recording speed and reading sensitivity.

(5) Preparation of the lamp for the dysprosium, used in the working substance is dysprosium iodide, dysprosium lamp, which lamp has high brightness, good color, high color temperature, small size, arc stability, etc., has been used in film, printing And other lighting sources.

(6) Because the cerium element has a large neutron capture cross-sectional area, it is used in the atomic energy industry to determine the neutron energy spectrum or to make a neutron absorber.

(7) Dy ₃ Al ₅ O ₁₂ can also be used as a magnetic working substance for magnetic refrigeration. With the development of science and technology, the application fields of 镝 will continue to expand and extend.

Yttrium oxide

Neodymium iron alloy

NdFeB-grade strontium iron alloy

Add a small amount of 镝 (dy) metal material 1

Add a small amount of 镝 (dy) metal material 2

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