Terbium grades, chemical composition
Terbium is a chemical element number 65 of group III of
Melting point is 1356 °C, boiling point 3227 °C. Specific weight under normal conditions is almost 8.3 g/cm³. Under normal conditions in the air, this metal is fairly stable, its a-modification has a hexagonal structure similar to Mg, stable up to t ° 1287 ° C and cubic b-modification (similar in type to the structure of a-Fe) at further increasing temperature. A terbium modification with a trigonal lattice is obtained under 1 GPa pressure. In water, Tb (OH)3 is formed at boiling point. Mineral acids readily dissolve terbium to form salts. If the salts of terbium are calcined in air at t ° 800 °-1000 ° C, it is possible to isolate the oxide Tb4 O7. TbO2 dioxide is formed by thermal decomposition of Tb (OH)3. The trivalent terbium ion is the most stable. Tetravalent ion exists only in hetero-poly compounds.
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Laser optics, production of phosphors, thermoelectric and magnetic materials, magnetostrictive alloys, semiconductor parts of computers. Terbium-doped iron is considered to be the best magnetostrictive alloy today and serves as the basis for powerful ultrasonic radiators as well as giant servomotors, such as large telescopes. In addition, experimental terbium compounds such as Tb titanate monocrystal, which has enormous magnetostriction, are used.
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