Beryllium Oxide - Materials / Alfa Chemistry

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Beryllium Oxide

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Catalog Number

ACMA00014301

Product Name

Beryllium Oxide

Category

Glass Additives

Description

Beryllium oxide is an odorless white solid. Sinks in water. (USCG, 1999);WHITE CRYSTALS OR POWDER.

IUPAC Name

oxoberyllium

Molecular Weight

25.012g/mol

Molecular Formula

BeO;BeO;BeO

Canonical SMILES

[Be]=O

InChI

InChI=1S/Be.O

InChI Key

LTPBRCUWZOMYOC-UHFFFAOYSA-N

Boiling Point

3787 °C;3787 °C

Melting Point

2578 °C;2530 °C

Density

3 at 68 °F (USCG, 1999);3.01 g/cu cm;3.0 g/cm³

Solubility

Insoluble in water; slightly soluble in acid and alkali solutions;2 ug/100 mL in water at 30 °C; soluble in concentrated sulfuric acid, fused potassium hydroxide;Slowly soluble in concentrated acids or fixed alkali hydroxides;Solubility in water: insoluble

Application

Beryllium oxide serves a critical role in various industrial and technological applications due to its exceptional properties. It is vital in manufacturing high-temperature refractory materials and high-quality electrical porcelains, including components like aircraft spark plugs and ultrahigh-frequency radar insulators. The material is prized in the electrical and electronics sectors for its high thermal conductivity and excellent high-frequency electrical insulating capabilities. Beryllium oxide is also used as a slurry to coat graphite crucibles, preventing contamination from carbon when melting alloys. It forms crucibles that withstand exceptionally high-purity or reactive metal processing. In microelectronics, custom-shaped beryllium oxide ceramics facilitate the close packing of semiconductor functions due to their high thermal conductivity and insulating properties, comparable to aluminum. Its use extends to the nuclear industry, where its refractoriness, high thermal conductivity, and ability to moderate fast neutrons enhance the efficiency of nuclear reactions and make it suitable for use in reflectors, fuel element matrices, and potentially shielding and control rod assemblies.

Color/Form

White hexagonal crystals;Light, amorphous powder;White, amorphous powder or white hexagonal crystals

Complexity

Covalently-Bonded Unit Count

EC Number

215-133-1

Exact Mass

25.007098g/mol

Formal Charge

Heavy Atom Count

ICSC Number

1325

MeSH Entry Terms

beryllium oxide

Monoisotopic Mass

25.007098g/mol

Odor

Odorless

Other Experimental

After ignition it is almost insoluble in water, concentrated acids or solutions of fixed alkali hydroxides;Mohs hardness: 9;Extremely stable ... its stability depends on its structure and is determined by the content of bound water. The higher the calcination temperature, the more inert the beryllium oxide.;Pure (100%) beryllium oxide insulates electrically like a ceramic, but conducts heat like a metal.;Piezoelectric or pyroelectric. ... Undergoes hexagonal to tettragonal transition at 21 °C;Linear coefficient of thermal expansion = 5X10-6 1/K;Specific heat = 1.00 J/g-K at 292 K;Thermal conductivity = 264 W/m-K at room temperature;Electrical resistence = 1X10+16 ohm-m at room temperature;Heat resistant

Refractive Index

Index of refraction: 1.719, 1.733

Rotatable Bond Count

RTECS Number

DS4025000

Stability

Stable under recommended storage conditions.

UN Number

1566;1566;1566

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