Light Magnesium Oxide

Magnesium oxide (MgO), or magnesia, is a white hygroscopic solid mineral that occurs naturally as periclase and is a source of magnesium (see also oxide). It has an empirical formula of MgO and consists of a lattice of Mg2+ ions and O2− ions held together by ionic bonding. Magnesium hydroxide forms in the presence of water (MgO + H2O → Mg(OH)2), but it can be reversed by heating it to remove moisture.

Magnesium oxide was historically known as magnesia alba (literally, the white mineral from Magnesia), to differentiate it from magnesia negra, a black mineral containing what is now known as manganese.

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Application

It is used for refractory applications,Cattle feed, paper and pulp production, fertilizers, sorelcement and grinding wheels, brakelinings, water purification, slurry treatment, chemical application, sugar refining, rubber and plastic, glass and enamel and metallurgical application.

Chemical formula

MgO
Molar mass

40.304 g/mol
Appearance

White powder
Odor

Odorless
Density

3.6 g/cm3
Melting point

2,852 °C (5,166 °F; 3,125 K)[
Boiling point

3,600 °C (6,510 °F; 3,870 K)[
Solubility

Soluble in acid, ammonia
insoluble in alcohol
Band gap

7.8 eV
Magnetic susceptibility (χ)

−10.2·10−6 cm3/mol
Thermal conductivity

45–60 W·m−1·K−1
Refractive index (nD)

1.7355
Dipole moment

6.2 ± 0.6 D

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