Lantan brand, chemical structure
Lanthanum — the element of the third group of the 6th period of the table of D. I. Mendeleev. Atomic number 57. Is denoted by La. This light silver color metal. History of discovery it is associated with the study of the «cerium earth». In 1826 K. Mosander proved that it is heterogeneous and it has another element in addition to cerium. In 1839, the scientist was able to isolate that element which he named lanthanum from the Greek «hidden», «hidden». The industrial production of this element is based on the separation of raw materials into fractions. First, separate the cerium, and then the extraction of the separated neodymium, praseodymium, and finally the Lantana. The latter exists in three crystalline models: the hexagonal α-lattice 277 °C, with a cubic β-bars to 861 °C and body-centered lattice type α-Fe.
|The atomic number of La||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|
The oxide, La2 O3 used in the manufacture of special optical glass in the manufacture of astronomical prisms and lenses for photos and filming. Broad use of lanthanum found in nuclear energy, electronics, electron microscopy, the production of hydrogen acceptors, thermoelectric and metal hydride materials, etc. sectors of the economy. In metallothermy it is used for recovery of rare elements. With his help, recovered plutonium during reprocessing of nuclear fuel. In molten uranium mixed with plutonium added lanthanum, which together with the plutonium emerges from the mass of the melt. While the uranium remains in the sediment. This top layer is decanted and then processed chemically. The oxide, La2 O3 is used for the production of high-temperature superconductors together with the oxides of barium, yttrium, strontium.
Tungsten rods with the addition of the oxide, La2 O3 are made of polished and forged, type VL, with a diameter of 1.5−8 mm and a length not less than 500 mm, Such electrodes during welding increase the carrying capacity and the maximum current in half. They are more durable than thorium and cerium, didn’t wear out. Uniform distribution of La2 O3 on the length of the electrode retains its original sharpening for much longer. The presence of oxide of lanthanum, Lao-W Lao, D, LaCl3, LaF3, LaCO3, LaSO4, etc., in alloys for the manufacture of wire, sheets and rods enhance the technological quality of the material
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