What are the different uses of scandium
|Hazardous substance labeling|
|R and S phrases||R: 11 (powder)|
|S: 16 (powder)|
|As far as possible and customary, SI units are used. |
Unless otherwise noted, the data given apply to standard conditions.
Scandium (from lat. Scandia "Scandinavia") is a chemical element in the periodic table of the elements with the symbol Sc and the atomic number 21. The soft, silver-white element is the first of the transition metals and is also assigned to the rare earth metals.
Scandium was discovered by Lars Fredrik Nilson in 1879. From 10 kg of euxenite and gadolinite, he isolated an oxide with previously unknown properties. He named the new element he suspected "Scandium" in honor of his homeland. As early as 1869, Dmitri Ivanovich Mendeleev predicted an element Eka-Bor with the ordinal number 21. Only Per Teodor Cleve later recognized the correspondence of the scandium with the eka-boron.
Pure scandium was first produced electrolytically in 1937 from a eutectic melt of potassium, lithium and scandium chloride at 700 to 800 ° C.
Scandium is one of the rare elements. It does not occur elementally, it is only found in a few rare minerals in enriched form:
- Thortveitite: (Sc, Y)2Si2O7
- Scandium ixiolite: (Ta, Nb, Sn, Mn, Fe, Sc)2O4
- Bazzit: (Sc, Fe)2Be3Si6O18
- Kolbekit: ScPO4 · H2O
Scandium is found in low concentrations in over 800 minerals. It is therefore also contained in ore concentrates of the transition metals as an "impurity". These include Russian and Chinese wolframite and tantalite concentrates. Scandium compounds are also produced when processing ores containing uranium.
The blue color of aquamarine, a variety of beryl, is said to be due to Sc3+ Ions are caused.
Extraction and manufacture
The main starting material is thortveitite, which is processed into scandium oxide in several process steps. Metallic scandium is then produced by converting it to fluoride and reducing it with calcium.
Because of its density, scandium is one of the light metals. In air it becomes dull, a protective yellowish oxide layer is formed. Scandium reacts with dilute acids to form hydrogen and trivalent cations. The conversion to scandium oxide Sc takes place in steam from 600 ° C2O3. In aqueous solutions, Sc cations behave similarly to aluminum, which often causes difficulties in analytical separations. In a mixture of nitric acid and 48% hydrogen fluoride, it should be resistant.
Scandium is mainly used as scandium iodide in high-performance, high-pressure mercury vapor lamps, for example for stadium lighting. Together with holmium and dysprosium, a light similar to daylight is created. Scandium is also used to make laser crystals.
Scandium oxide is added to magnetic data storage media to increase the rate of magnetization reversal.
As an alloy additive, scandium shows structure-stabilizing and grain-size-reducing effects. An aluminum-lithium alloy with a small amount of scandium is used to manufacture some components in Russian fighter planes. Scandium alloys, which are often lighter than carbon components, are also used in the modern bicycle industry.
Scandium powder is flammable and therefore classified as flammable.
- ↑ ab Safety data sheet (Acros)
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