Aluminum oxide

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Aluminum oxide
General
Other names	alumina aluminium(III) oxide
Molecular formula	Al2O3
Molar mass	101.96 g/mol101.96 amu
CAS number	[1344-28-1]
Properties
Solubility in water	insoluble
Melting point	2054 °C2,327.15 K 3,729.2 °F 4,188.87 °R
Boiling point	~3000 °C
Thermal Conductivity	18 W m−1 K−1
Structure
Coordination geometry	octahedral
Crystal structure	cubic
Thermodynamic data
Standard enthalpy of formation ΔfHosolid	−1675.7 kJ mol−1
Standard molar entropy Sosolid	50.92 J mol−1 K−1
Heat capacity Cp	79.04 J mol−1 K−1
Hazards
MSDS	MSDS Data
NFPA 704	0 0 0
Flash point	non-flammable
Supplementary data page
Structure and properties	n, εr, etc., εr,
Thermodynamic data	Phase behaviour Solid, liquid, gas
Spectral data	UV, IR, NMR, MS
Related compounds
Other anions	aluminium hydroxide
Other cations	boron trioxide gallium oxide indium oxide thallium oxide
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Disclaimer and references

Aluminum Oxide is created when two Aluminum atoms and three Oxygen atoms combine together. Aluminum is a metal and Oxygen is a gas. The compound is crystalline. One of the most well known crystals of Aluminum oxide is corundum. Corundum is usually a clear crystal but if there are impurities it can be different colors. We get rubies and sapphires from it. Aluminum oxide is really strong and is resistant to wear, which is why it is used in ceramics. Aluminum oxide has many everyday uses.

Contents 1 Properties 2 Occurrences 3 Uses 4 Gallery 5 Related References 6 See Also

Properties

Aluminum oxide has good mechanical strength, heat conductivity, fire resistance, corrosive and wear resistance, sliding properties, and also it is a good electric insulator. Aluminum Oxide is very hard, it is rated a 9 on Mohs scale of mineral hardness.

There are two different ways to find the optical properties of aluminum oxide. Those ways are by using vacuum ultraviolet spectroscopy and by electron energy-loss spectroscopy. Vacuum ultraviolet spectroscopy by definition means, a method of spectral analysis using wavelengths between 100 and 300 nm that utilizes both emission and absorption techniques. Electron energy-loss spectroscopy means substance is bombarded with monochromatic electrons, and the energies of scattered electrons are measured to determine the distribution of energy loss.

Occurrences

Aluminum Oxide is mined up from the earth. One of its forms is a crystal which is called Corundum. Rubies and sapphires come from this crystal. What happens is that when you get corundum from the earth it is a clear crystal but sometimes if there are impurities in the crystal they change colors. Most of the rubies and sapphires are mined in Australia, Madagascar, and Montana.

Uses

Aluminum Oxide can be used in the making of ceramics. It is very useful when you are making ceramics because it has good mechanical strength, heat conductivity, fire resistant, corrosion and wear resistance, sliding properties, and it is a good electric insulation. Those properties do not relate to all of the ceramics that are created from aluminum oxide. Aluminum oxide can be mined and sometimes it is used as a natural abrasive so most emery boards are made from aluminum oxide, also a lot of sandpaper is made from Aluminum Oxide. It is also used in the coating of compact fluorescent lamps. Microdermabrasion uses aluminum oxide crystals. Aluminum oxide can be found as a crystal which is called corundum.

Gallery

Aluminum oxide slag - a byproduct of Solid rocket motor.

Related References

• Aluminium OxideWikipedia
• Uses of Aluminum Oixde aluminum Occurrence, uses, and properties.
• CeramTec The Ceramic ExpertsWhat is Aluminum Oxide
• ALUMINIUM Aluminum
• Properties of aluminum oxideOptical Properties of Aluminum Oxide
• [1]optical properties

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See Also