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7440-39-3
Ba
5600GN
99.9%
3 mm - 25 mm
231-149-1
Class 4.3
UN1400
PG II
Characteristic
Barium is a chemical element with the symbol Ba and atomic number 56. It is the fifth element in group 2 and is a soft, silvery alkaline earth metal.
Phase at STP：solid
Appearance：silvery gray; with a pale yellow tint
Melting point：1000 K (727 °C, 1341 °F)
Boiling point：2118 K (1845 °C, 3353 °F)
Density (near r.t.)：3.51 g/cm3
when liquid (at m.p.)：3.338 g/cm3
Heat of fusion：7.12 kJ/mol
Heat of vaporization：142 kJ/mol
Molar heat capacity：28.07 J/(mol·K)
Application
Barium has few industrial applications. Historically, it was used as a getter for vacuum tubes and in oxide form as the emissive coating on indirectly heated cathodes. It is a component of YBCO (high-temperature superconductors) and electroceramics, and is added to steel and cast iron to reduce the size of carbon grains within the microstructure. Barium compounds are added to fireworks to impart a green color. Barium sulfate is used as an insoluble additive to oil well drilling fluid, as well as in a purer form, as X-ray radiocontrast agents for imaging the human gastrointestinal tract. The soluble barium ion and soluble compounds are poisonous, and have been used as rodenticides.
Characteristic
Barium is a chemical element with the symbol Ba and atomic number 56. It is the fifth element in group 2 and is a soft, silvery alkaline earth metal.
Phase at STP：solid
Appearance：silvery gray; with a pale yellow tint
Melting point：1000 K (727 °C, 1341 °F)
Boiling point：2118 K (1845 °C, 3353 °F)
Density (near r.t.)：3.51 g/cm3
when liquid (at m.p.)：3.338 g/cm3
Heat of fusion：7.12 kJ/mol
Heat of vaporization：142 kJ/mol
Molar heat capacity：28.07 J/(mol·K)
Application
Barium has few industrial applications. Historically, it was used as a getter for vacuum tubes and in oxide form as the emissive coating on indirectly heated cathodes. It is a component of YBCO (high-temperature superconductors) and electroceramics, and is added to steel and cast iron to reduce the size of carbon grains within the microstructure. Barium compounds are added to fireworks to impart a green color. Barium sulfate is used as an insoluble additive to oil well drilling fluid, as well as in a purer form, as X-ray radiocontrast agents for imaging the human gastrointestinal tract. The soluble barium ion and soluble compounds are poisonous, and have been used as rodenticides.
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