Samarium brand, chemical structure
Samarium is in the third group of the table of Mendeleev, where indicated by the chemical symbol Sm. Atomic number No. 59, Refers to the lanthanides. the atomic weight 150,36. Was isolated from the mineral samarskite. The contents in the lithosphere — 8 g/t, dissolved in the sea water 1.7·10-6 mg/l, electrolytic or metallothermic Get through, most of it by ion exchange from monazite sand. The world’s annual consumption of several hundred tons.
|Atomic number||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. 59||150,36||2, 3||7,52||1097°C||1791°C||165|
On technological qualities of the metal similar to zinc, and in appearance like a lead. Under normal conditions, the air-samarium coated with dark oxide film Sm2 O3, with further oxidation of the metal is transformed into a gray-yellow powder. In the compounds has a valence of +3. Ignites in air. Easily soluble inorganic acids. With nitrogen it forms the nitride, carbon, carbide, and hydrogen — hydride, boron boride, etc
Production of thermoelectric and testcustomermap materials. Samarium and cobalt are the basis for powerful permanent magnets. Definition of samarium in the double alloys Sm+Co posredstvom chelatometric method normalizes GOST 25 278.8−82. In the alloy with a Zr, Co, Cu, Hf, and Fe achieved a high level of residual induction and coercive force. In nuclear energy the metal helps to control of atomic decay. In comparison with elements such as boron or cadmium check thermal neutrons, samarium not «fade» in the reactor, and the irradiation forms isotopes of a wide cross-section of neutron capture. In the design of cell phones and color displays, samarium is used as an activator in phosphors. It is used in solid and liquid lasers, as well as in electrodes for starters smoldering bits.
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