Aluminium oxide

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Aluminium oxide
Identifiers
CAS number 1344-28-1 YesY
PubChem 9989226
ChemSpider 8164808 YesY
UNII LMI26O6933 YesY
RTECS nummer BD120000
ATC code D10AX04
Jmol-3D images Image 1
Image 2
Properties
Molecular formula Al2O3
Molar mass 101.96 g mol−1
Appearance white solid
Odor odorless
Density 3.95–4.1 g/cm3
Meltin pynt

2,072 °C (3,762 °F; 2,345 K)[2]

Boilin pynt

2,977 °C (5,391 °F; 3,250 K)[3]

Solubility in water insoluble
Solubility insoluble in diethyl ether
practically insoluble in ethanol
Thermal conductivity 30 W·m−1·K−1[1]
Refractive index (nD) nω=1.768–1.772
nε=1.760–1.763
Birefringence 0.008
Structure
Crystal structur Trigonal, hR30, space group = R3c, No. 167
Coordination
geometry
octahedral
Thermochemistry
Std enthalpy o
formation
ΔfHo298
−1675.7 kJ·mol−1[4]
Staundart molar
entropy
So298
50.92 J·mol−1·K−1[4]
Hazards
EU classification Nae listed.
NFPA 704
NFPA 704.svg
0
1
0
Flash pynt non-flammable
U.S. Permissible
exposur leemit (PEL)
OSHA 15 mg/m3 (Total Dust)
OSHA 5 mg/m3 (Respirable Fraction)
ACGIH/TLV 10 mg/m3
Related compounds
Ither anions aluminium hydroxide
Ither cations boron trioxide
gallium oxide
indium oxide
thallium oxide
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Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Aluminium oxide is a chemical compoond o aluminium an oxygen wi the chemical formula Template:Aluminium2O3. It is the maist commonly occurring o several aluminium oxides, an specifically identified as aluminium(III) oxide. It is commonly cried alumina, an mey an aa be cried aloxide, aloxite, or alundum dependin on particular furms or applications. It commonly occurs in its crystalline polymorphic phase α-Al2O3, in which it comprises the mineral corundum, varieties o which furm the precious gems ruby an sapphire. Al2O3 is signeeficant in its uise tae produce aluminium metal, as an abrasive owin tae its hairdness, and as a refractory material owin tae its heich meltin pynt.[5]

References[eedit | eedit soorce]

  1. Material Properties Data: Alumina (Aluminum Oxide). Makeitfrom.com. Retrieved on 2013-04-17.
  2. Patnaik, P. (2002). Handbook of Inorganic Chemicals. McGraw-Hill. ISBN 0-07-049439-8. 
  3. Roew, Raymond (2009). "Adipic Acid". Handbook of Pharmaceutical Excipients. pp. 11–12. 
  4. 4.0 4.1 Zumdahl, Steven S. (2009). Chemical Principles 6th Ed. Houghton Mifflin Company. ISBN 0-618-94690-X. 
  5. "Alumina (Aluminium Oxide) – The Different Types of Commercially Available Grades". The A to Z of Materials. Archived from the original on 10 October 2007. Retrieved 2007-10-27.