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Beryllium
Beryllium Oxide
Find Beryllium oxide



Beryllium oxide

Beryllium oxide
Image:Beryllium oxide.jpg
General
Other names Beryllia
Molecular formula BeO
Molar mass 25.01 g/mol
Appearance white solid
CAS number [1304-56-9]
Properties
Density and phase 3.0 g/cm3, solid
Solubility in water insoluble
Melting point 2530 °C
Boiling point 3900 °C
Structure
Coordination
geometry
 ?
Crystal structure  ?
Thermodynamic data
Std enthalpy of
formation
ΔfHo298
−609 kJ/mol
Standard molar
entropy
So298
13.8 J·K−1·mol−1
Hazards
MSDS External MSDS
EU classification Highly toxic (T+)
Carc. Cat. 2
R-phrases R49, R25, R26,
R36/37/38, R43, R48/23
S-phrases S53, S45
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  ?
Other cations Magnesium oxide
Calcium oxide
Except where noted otherwise, data are given for
materials in their standard state (at 25 °C, 100 kPa)

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 formed at high temperatures (>800°C) is inert and is only easily dissolved in 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.

WARNING: BeO is carcinogenic.

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