Barium oxide

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Template:Chembox E numberTemplate:Chembox SolubilityInWater
Barium oxide
Other names Barium monoxide; barium protoxide; calcined baryta
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Molar mass 153.3 g/mol
Appearance white solid
Density 5.7 g/cm³, solid
Melting point
Boiling point
Crystal structure cubic
EU classification {{{value}}}
R-phrases R20/22
S-phrases (S2), S28
Flash point {{{value}}}
Related compounds
Other anions {{{value}}}
Other cations {{{value}}}
Except where noted otherwise, data are given for
materials in their standard state
(at 25 °C, 100 kPa)

Infobox disclaimer and references

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


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 diarrhea, 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]


  1. "Compounds of barium: barium (II) oxide". Web Elements. The University of Sheffield. 2007-01-26. Retrieved 2007-02-22. line feed character in |title= at position 21 (help)
  2. "Barium Oxide (chemical compound)". Encyclopædia Britanica. Encyclopædia Britanica. 2007. Retrieved 2007-02-19.
  3. Nield, Gerald; Washecheck, Paul; Yang, Kang (05-04), United States Patent 4210764, retrieved 2007-02-20 Check date values in: |date=, |year= / |date= mismatch (help)
  4. "Barium Oxide (ICSC)". IPCS. October 1999. Retrieved 2007-02-19.

External links

ar:أكسيد باريوم da:Bariumoxid de:Bariumoxid lv:Bārija oksīds