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. R-phrases are defined in Annex III of European Union Directive 67/548/EEC: Nature of special risks attributed to dangerous substances and preparations. ... S-phrases are defined in Annex IV of European Union Directive 67/548/EEC: Safety advice concerning dangerous substances and preparations. ... For other uses, see Flash point (disambiguation). ... This article is about the electrically charged particle. ... Beryllium telluride is a chemical compound of beryllium and tellurium. ... This article is about the electrically charged particle. ... Magnesium oxide, or magnesia, is a white solid mineral that occurs naturally as periclase and is a source of magnesium. ... Calcium oxide (CaO), commonly known as lime, quicklime or burnt lime, is a widely used chemical compound. ... This page provides supplementary chemical data on beryllium oxide. ... This page provides supplementary chemical data on beryllium oxide. ... The refractive index (or index of refraction) of a medium is a measure for how much the speed of light (or other waves such as sound waves) is reduced inside the medium. ... The relative dielectric constant of a material under given conditions is a measure of the extent to which it concentrates electrostatic lines of flux. ... This page provides supplementary chemical data on beryllium oxide. ... This page provides supplementary chemical data on beryllium oxide. ... Ultraviolet-Visible Spectroscopy or Ultraviolet-Visible Spectrophotometry (UV/ VIS) involves the spectroscopy of photons (spectrophotometry). ... Infrared spectroscopy (IR spectroscopy) is the subset of spectroscopy that deals with the infrared region of the electromagnetic spectrum. ... Nuclear magnetic resonance spectroscopy most commonly known as NMR spectroscopy is the name given to the technique which exploits the magnetic properties of certain nuclei. ... Mass spectrometry (previously called mass spectroscopy (deprecated)[1] or informally, mass-spec and MS) is an analytical technique used to measure the mass-to-charge ratio of ions. ... The plimsoll symbol as used in shipping In chemistry, the standard state of a material is its state at 1 bar (100 kilopascals exactly). ... General Name, symbol, number beryllium, Be, 4 Chemical series alkaline earth metals Group, period, block 2, 2, s Appearance white-gray metallic Standard atomic weight 9. ... Sintering is a method for making objects from powder, increasing the adhesion between particles as they are heated. ... This article is about ceramic materials. ... Alumina redirects here. ... Polymorphism in materials science is the ability of a solid material to exist in more than one form or crystal structure. ...

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). Ammonium hydrogen fluoride is a compound formed from ammonium fluoride and hydrogen fluoride, with hydrogen fluoride molecules occupying spaces in the ammonium fluoride crystal lattice. ... R-phrases S-phrases , , , Flash point Non-flammable Related Compounds Related strong acids Selenic acid Hydrochloric acid Nitric acid Related compounds Hydrogen sulfide Sulfurous acid Peroxymonosulfuric acid Sulfur trioxide Oleum Supplementary data page Structure and properties n, εr, etc. ... Ammonium sulphate, [NH4]2[SO4] contains 21% nitrogen as ammonia and 24% sulfur as sulfate. ...

Unlike oxides formed by the other alkaline earth metals, beryllium oxide is amphoteric rather than basic. Amphoteric redirects here. ...

Currently There are only two companies in the United States that manufacture Beryllium Oxide. they are American Beryllia Inc. of Haskell New Jersey, and Brush Ceramics of Tucson Arizona. American Beryllia Inc. ... // Haskell may refer ro: Haskell (programming language), a standardized pure functional programming language with non-strict semantics Haskell Indian Nations University, a four year degree granting university in Lawrence, Kansas which offers free tuition to members of registered Native American tribes in the United States Haskell Free Library and Opera... This article is about the U.S. state. ... Nickname: The Old Pueblo Location in Pima County and the state of Arizona Coordinates: Country United States State Arizona Counties Pima Mayor Bob Walkup (R) Area    - City 505. ... Official language(s) English Spoken language(s) English 74. ...

Applications

This complex is used for rocket engines, catalysts, semiconductors, moderators of atomic reactors, and neutron reflectors. A catalyst (Greek: καταλύτης) is a substance that accelerates the rate of a chemical reaction, at some temperature, but without itself being transformed or consumed by the reaction (see also catalysis). ... A semiconductor is a material that is an insulator at very low temperature, but which has a sizable electrical conductivity at room temperature. ... This does not cite any references or sources. ...

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. K value redirects here. ... Power semiconductor devices are semiconductor devices used as switches or rectifiers in power electronic circuits (switch mode power supplies for example). ... Not to be confused with Silicone. ... Thermal resistance is the temperature difference across a structure when a unit of heat energy flows through it in unit time. ... Alumina redirects here. ... This article is about ceramic materials. ... Structure of a vacuum tube diode Structure of a vacuum tube triode In electronics, a vacuum tube, electron tube, or (outside North America) thermionic valve or just valve, is a device used to amplify, switch or modify a signal by controlling the movement of electrons in an evacuated space. ... A cavity magnetron is a high-powered vacuum tube that generates coherent microwaves. ... The gas laser is a kind of laser in which some sort of gas (such as helium or neon) is discharged to produce the laser light. ...

Safety

BeO is carcinogenic if the powder is ingested or inhaled and may cause chronic beryllium disease. The hazard symbol for carcinogenic chemicals in the Globally Harmonized System. ... Berylliosis is a chronic lung disease caused by prolonged exposure to beryllium, a chemical irritant to the lungs. ...

References

This article does not cite any references or sources. (September 2007) Please help improve this article by adding citations to reliable sources. Unverifiable material may be challenged and removed.

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External links

• IARC Monograph "Beryllium and Beryllium Compounds"
• International Chemical Safety Card 1325
• National Pollutant Inventory - Beryllium and compounds
• NIOSH Pocket guide to Chemical Hazards