BARIUM OXIDE

Barium oxide
Systematic name	Barium Oxide
Other names	Barium monoxide
	Barium protoxide
	Calcined baryta
General
Molecular formula	BaO
Molar mass	153.3 g/mol
Appearance	white solid
CAS number	[1304-28-5]
Properties
Density and phase	5.7 g/cm³, solid
Solubility in water	3.8 g/100 ml (20 °C)
Melting point	1923 °C
Boiling point	~2000 °C
Structure
Coordination geometry	Octahedral
Crystal structure	cubic
Hazards
MSDS	External MSDS
EU classification	Harmful ('Xn')
NFPA 704
R-phrases
S-phrases	,
Flash point	non-flammable
Supplementary data page
Structure and properties	''n'', εr, etc.
Thermodynamic data	Phase behaviour Solid, liquid, gas
Spectral data	UV, IR, NMR, MS
Related compounds
Other anions	Barium hydroxide Barium peroxide
Other cations	Calcium oxide Strontium oxide
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)

'Barium oxide', BaO, is a white hygroscopic compound formed by the burning of barium in oxygen, although it is often formed through the decomposition of other barium salts.^[1]
: 2Ba + O₂ → 2BaO
: BaCO₃ → BaO + CO₂
It transforms into barium hydroxide on contact with water.
: BaO + H₂O → Ba(OH)₂

Contents

Uses

Safety issues

References

External link

Uses

Barium oxide is used as a coating for hot cathodes, and in cathode ray tubes. It is used in the production of certain kinds of glass such as optical crown glass. It replaced lead oxide. Lead oxide was used to raise the refractive index, but it also raised the dispersive power. Barium oxide only raises the refractive index.^[2] Barium oxide also has use as an ethoxylation catalyst in the reaction of ethylene oxide and alcohols, which takes place 150 and 200°C.^[3]

Safety issues

Barium oxide is an irritant. If it contacts the skin or the eyes or is inhaled it causes pain and redness. However, it is more dangerous when ingested. It can cause nausea and diarrhoea, muscle paralysis, cardiac arrhythmia, and can cause death. If ingested, medical attention should be sought immediately.
Barium oxide also is dangerous to the environment. It is harmful especially to aquatic organisms^[4]

References

1. Compounds of barium:
barium (II) oxide
2. Barium Oxide (chemical compound)
3.
4. Barium Oxide (ICSC)

External link

★ International Chemical Safety Card 0778