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Your current location :Home > Magnesium Oxide (MgO)

Magnesium Oxide (MgO)

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 separate moisture.

Magnesium oxide was historically known as magnesia alba (literally, the white mineral from magnesia - other sources give magnesia alba as MgCO3), to differentiate it from magnesia negra, a black mineral containing what is now known as manganese.

While "magnesium oxide" normally refers to MgO, magnesium peroxide MgO2 is also known as a compound. According to evolutionary crystal structure prediction, MgO2 is thermodynamically stable at pressures above 116 GPa (gigapascals), and a totally new semiconducting suboxide Mg3O2 is thermodynamically stable above 500 GPa. Because of its stability, MgO is used as a model system for investigating vibrational properties of crystals.

Basic Infomation

IUPAC name:Magnesium oxide

CAS Number:1309-48-4


EC Number:215-171-9


RTECS number:OM3850000

Chemical formula:MgO

Molar mass:40.3044 g/mol

Appearance:White powder


Density:3.58 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 in water:0.00062 g/100 mL (0 °C)0.0086 g/100 mL (30 °C)

Solubility:Soluble in acid, ammonia,insoluble in alcohol

Band gap:7.8 eV

Thermal conductivity:45–60 W·m−1·K−1

Refractive index (nD):1.7355

Dipole moment:6.2 ± 0.6 D

Crystal structure:Halite (cubic), cF8

Space group:Fm3m, No. 225

Lattice constant:a = 4.212Å

Coordination geometry:Octahedral (Mg2+); octahedral (O2−)

Specific heat capacity (C):37.8 J/mol K

Std molar entropy (So298):26.9 J·mol−1·K−1[3]

Std enthalpy of formation (ΔfHo298):−601.8 kJ·mol−1

Gibbs free energy (ΔfG˚):-596.6 kJ/mol


ATC code:A02AA02,A06AD02, A12CC10

Main hazards:Metal fume fever, Irritant

Safety data sheet:ICSC 0504

R-phrases:R36, R37, R38

Flash point:Non-flammable

US health exposure limits (NIOSH):

PEL (Permissible):TWA 15 mg/m3 (fume)

REL (Recommended):None designated

IDLH (Immediate danger:750 mg/m3 (fume)

Base Information

Boiling Point 760 mm Hg:3600 oC 

Melting Point:2852 oC

Specific Gravity:3.60 

Appearance and Odor:White to gray powder, odorless 

Solubility in H2O:Slightly (<0.1%)

MgO Sputtering targetMagnesium Oxide Target

Purity--- 99.99%

Shape --- Discs, Plate,Step (Dia ≤480mm,, Thickness ≥1mm)

Rectangle, Sheet, Step (Length ≤400mm, Width ≤300mm, Thickness ≥1mm)

Magnesium Oxide Evaporation Material Magnesium Oxide Evaporation Material 

Melting point--- 2800℃,Vapour pressure at 1700℃ 1Pa,at 1900℃ 10Pa, 

Purity--- 99.99% Density--- ~3.58 g/cm3 , Solubility soluble in acid
Linear expansion coefficient ---11.2×10-6/K(300K)
Specific heat capacity--- 0.209 Cal/g.K(273K)
Hardness--- (acc. to Mohs) 5.5, (acc. to Knoop) 692 g/mm2
Properties of thin film---
Transmission range 200~8000nm
Refractive index at 550nm 1.73, at 1014nm 1.72, at 2325nm 1.70, at 5138nm 1.63
Hints on evaporation---
Evaporation with electron beam gun.
Evaporation pressure 5×10-3Pa
Shape---solid substance, White tablets

Magnesium Oxide Wafer

Shape--- disk, sheet, tube, step, taper 

Purity --- 99.99%

Diameter --- 30-300mm Length --- 300mm Width: 300mm

Thickness --- 0.5-100mm

Magnesium Oxide Powder ( high purity MgO Powder) Purity ---99.5%,99.9%, 99.99%

Diameter --- 325mesh or other

Magnesium Oxide Nanometer Powder ( MgO nano-powder )

Appearance --- White powder 

Purity --- ≥99.9%

Average grain size (nm) --- 40

Specific surface area (m2/g) --- ≥50

Loss of weight in drying --- ≤0.5

Loss of weight in burning (%) --- ≤0.2

Appearance --- White powder Purity --- ≥99%

Average grain size --- 100nm

Specific surface area (m2/g) --- ≥7.3

Loss of weight in drying --- ≤0.3

Loss of weight in burning (%) --- ≤0.1

Application --- Nano magnesium oxide is white, odourless, and non-toxic. Due to its unique property, it is widely used in electronic, catalytic, ceramic, oil product, coating and other fields. In the textile field, with the ever-growing demands for high-performance fire-retardant fibre, the synthesis of a new-type and high-performance fire retarding agent will provide an ideal material for the development of a functional fabric. Nanomagnesium oxide is usually used, together with wood chips and wood shavings, to make refractory materials, such as light-weight, sound-proof, heat-insulating and refractory fiber board and metallic ceramics. As compared with some traditional phosphorus or halogen-containing organic fire retarding agent, nanomagnesium oxide is non-toxic, odourless and less in quantity to be added, therefore it is an ideal additive for developing fire-retarding fibre. Moreover, when it is used in fuel, nanomagnesium oxide has a strong ability to clean and inhibit corrosion, therefore it has good prospect of application in coating.




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