Gourt Home::Gourt :: Magnesium oxide
| General | |
|---|---|
| Name | Magnesium oxide |
| Chemical formula | MgO |
| Appearance | White, powdery, solid |
| Physical | |
| Formula weight | 40.30 g/mol |
| Melting point | 3073 K (2800 °C) |
| Boiling point | 3873 K (3600 °C) |
| Density | 3.58 kg/dm3 |
| Crystal structure | Cubic FCC |
| Solubility | 0.00062 g in 100 g water |
| Thermochemistry | |
| ΔfH0liquid | ? kJ/mol |
| ΔfH0solid | -601 kJ/mol |
| S0solid | 32.51 J/(mol·K) |
| Misc. | |
| Thermal conductivity | 42 W m-1 K-1 at 0 °C |
| Coefficient of thermal expansion | 10.8 ×10-6/K at 0 °C |
| Specific heat capacity | 877 J kg-1 K-1 |
| Dielectric constant | 9.65 at 1 MHz |
| Young's modulus | 250 GPa |
| Shear Modulus | 155 GPa |
| Bulk modulus | 155 GPa |
| Poisson's ratio | 0.18 |
| Safety | |
| Ingestion | Used as an antacid and/or a laxative. Available over-the-counter. |
| Inhalation | Causes irritation of upper respiratory tract. |
| Skin | Causes irritation. |
| Eyes | Causes irritation. |
| SI units were used where possible. Unless otherwise stated, standard conditions were used. | |
Magnesium oxide is a white solid mineral that occurs naturally as periclase and is a source of magnesium. See also oxide. It has an empirical formula of . It is formed by an ionic bond between one magnesium and one oxygen atom.
Applications
It is used by many libraries for preserving/deacidifying books, and as an insulator in industrial cables. It is also used as a medication to relieve heartburn, sour stomach, or acid indigestion. Medical uses of Magnesium oxide also include using it as a short-term laxative, or used to supplement a diet with magnesium.
Magnesium oxide is used as a basic refractory material for lining crucibles.
Magnesium oxide is a principle ingredient in construction materials used for fireproofing.
It is used as a reference white color in colorimetry. The emissivity value is about 0.9
Pressed MgO is used as an optical material. It is transparent from 300 nm to 7 µm. The refractive index is 1.72 at 1 µm. It is sometimes known by the Eastman Kodak trademarked name Irtran-5.
Precautions
Inhalation of magnesium oxide fumes can cause metal fume fever.
See also
Related materials calcium oxide, barium oxide, Magnesium sulfide.
External links
- National Pollutant Inventory - Magnesium Oxide Fume Fact Sheet
- NIH medecinal use
- Data page at UCL
- Ceramic data page at NIST
- Emissivity
Suppliers
- Harrick Scientific products
- Lorad chemical - as an optical coating material
- Morgan Advanced Ceramics
Magnesium compounds | Oxides | Refractory materials | Optical materials | Ceramic materials
Òxid de magnesi | Magnesiumoxid | Magnesiumoxid | Magnesiumoxide | 酸化マグネシウム | Tlenek magnezu | Оксид магния | Магнезијум оксид | Magnesiumoxid | Ôxít magiê | 氧化镁
"Magnesium oxide"