Beryllium oxide

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Beryllium oxide
Other names Beryllia
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Molar mass 25.01
Appearance white solid
Density 3.0 g/cm³ (solid)
Melting point
Boiling point
EU classification {{{value}}}
R-phrases R49, R25, R26,
R36/37/38, R43, R48/23
S-phrases S53, S45
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)

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Beryllium oxide (BeO) is a white crystalline oxide. It is obtained from beryllium or beryllium compounds by ignition in the air. The sintered beryllium oxide (beryllia), which is very stable, has ceramic characteristics. It is similar to aluminium oxide (Al2O3), is highly fire resistant (melting point: 2570°C), and has polymorphism. Beryllium oxide was previously called glucina.

Beryllium oxide formed at high temperatures (>800°C) is inert but may be easily dissolved in hot aqueous ammonium bifluoride (NH4HF2) or a hot solution of concentrated sulfuric acid (H2SO4) and ammonium sulfate ((NH4)2SO4).


This complex is used for rocket engines, catalysts, semiconductors, moderators of atomic reactors, and neutron reflectors.

Beryllium oxide is used in many high-performance semiconductor parts for applications such as radio equipment because it has good thermal conductivity while also being a good electrical insulator. Some power semiconductor devices have used beryllium oxide ceramic to insulate the silicon chip from the metal mounting base of the package in order to achieve a lower value thermal resistance than for a similar construction made with aluminium oxide. It is also used as a structural ceramic for high-performance vacuum tubes, magnetrons, and gas lasers.


BeO is carcinogenic if the powder is ingested or inhaled and may cause chronic beryllium disease.


External links

cs:Oxid beryllnatý de:Berylliumoxid lb:Berylliumoxid fi:Berylliumoksidi