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Magnesium Oxide Powder - MgO
Magnesium Oxide Powder - MgO
- Purity---
- 99.99％
- Shape---
- Powder
- Dimension---
150mesh,200mesh,325mesh
- Property---
- Application---
- raw material
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 ChEMBL：1200572 EC Number：215-171-9 PubChem：14792 RTECS number：OM3850000 Chemical formula：MgO Molar mass：40.3044 g/mol Appearance：White powder Odor：Odorless 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 Pharmacology 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) |