Beryllium oxide

Revision as of 22:52, 8 August 2012 by WikiBot (talk | contribs) (Bot: Automated text replacement (-{{SIB}} + & -{{EH}} + & -{{EJ}} + & -{{Editor Help}} + & -{{Editor Join}} +))
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to: navigation, search
Template:Chembox E number
Beryllium oxide
Other names Beryllia
Identifiers
ECHA InfoCard Lua error in Module:Wikidata at line 879: attempt to index field 'wikibase' (a nil value). Lua error in Module:Wikidata at line 879: attempt to index field 'wikibase' (a nil value).
Properties
BeO
Molar mass 25.01
Appearance white solid
Density 3.0 g/cm³ (solid)
Melting point
Boiling point
Hazards
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)

Infobox disclaimer and references

WikiDoc Resources for Beryllium oxide

Articles

Most recent articles on Beryllium oxide

Most cited articles on Beryllium oxide

Review articles on Beryllium oxide

Articles on Beryllium oxide in N Eng J Med, Lancet, BMJ

Media

Powerpoint slides on Beryllium oxide

Images of Beryllium oxide

Photos of Beryllium oxide

Podcasts & MP3s on Beryllium oxide

Videos on Beryllium oxide

Evidence Based Medicine

Cochrane Collaboration on Beryllium oxide

Bandolier on Beryllium oxide

TRIP on Beryllium oxide

Clinical Trials

Ongoing Trials on Beryllium oxide at Clinical Trials.gov

Trial results on Beryllium oxide

Clinical Trials on Beryllium oxide at Google

Guidelines / Policies / Govt

US National Guidelines Clearinghouse on Beryllium oxide

NICE Guidance on Beryllium oxide

NHS PRODIGY Guidance

FDA on Beryllium oxide

CDC on Beryllium oxide

Books

Books on Beryllium oxide

News

Beryllium oxide in the news

Be alerted to news on Beryllium oxide

News trends on Beryllium oxide

Commentary

Blogs on Beryllium oxide

Definitions

Definitions of Beryllium oxide

Patient Resources / Community

Patient resources on Beryllium oxide

Discussion groups on Beryllium oxide

Patient Handouts on Beryllium oxide

Directions to Hospitals Treating Beryllium oxide

Risk calculators and risk factors for Beryllium oxide

Healthcare Provider Resources

Symptoms of Beryllium oxide

Causes & Risk Factors for Beryllium oxide

Diagnostic studies for Beryllium oxide

Treatment of Beryllium oxide

Continuing Medical Education (CME)

CME Programs on Beryllium oxide

International

Beryllium oxide en Espanol

Beryllium oxide en Francais

Business

Beryllium oxide in the Marketplace

Patents on Beryllium oxide

Experimental / Informatics

List of terms related to Beryllium oxide


Overview

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).

Applications

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.

Safety

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

References


External links

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



Linked-in.jpg