Cerium brand, chemical structure
Cerium is a rare earth element No. 58 of 3rd group of the table of D. I. Mendeleev, which he designated as CE. It is a soft silvery-white metal. Belongs to the group of lanthanides. The atomic weight of 140,115. Opened by a German scientist M. Clarocom and (independently of) the Swedish chemists Berzelius and Hisinger. This element was given the name in honor of the asteroid Ceres. The cerium content in the lithosphere almost 70g/t in sea water it is dissolved in the amount of 5.2·10-6 mg/L. Get it by electrolysis of molten fluoride CeF3.
UD. the weight of cerium at 20 °C = 6,77 g/cm3. Temperature reaches melting point 799 °C, t° boiling point 3426 °C. Even at room temperature it is unstable in the air slowly oxidized, it turns into a white oxide. Readily soluble in inorganic acids. There are two versions of this metal with the hexagonal β-lattice and cubic g-lattice. The transition temperature is 393 °C.
|The atomic number of Ce||Atomic (molar) mass, g/mol||The degree of oxidation||Density [g/cm3]||The melting temperature t°C||The boiling point of t°C||The heat of fusion kJ/kg|
|No. 58||140,115||2, 3||Of 6.77||799°C||3426°C||398|
Manufacture of glass, abrasive and thermoelectric materials, dental dentures. As the catalyst claimed dioxide SEO2. In metallurgy, this metal modified iron-magnesium alloys. When adding 1% GE increased the creep strength and the strength of the materials in the gap. It increases the conductivity and strength of aluminum, titanium, copper, structural steel. It is much cheaper than lanthanum, which has a similar effect, so that the cerium is used more widely. When alloying with zinc, an explosion occurs. Small additions of cerium cleans the steel of contaminants gases and sulfur. Alloying of steel normalizes GOST 12 364−84. Like other metals from the lanthanides group, and it is available in the form of a circle, wire, sheet, ribbon.
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