Aluminium oxide

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Aluminium oxide
Corundum-3D-balls.png
Aluminium oxide2.jpg
Identifiers
1344-28-1 YesY
ATC code
ChemSpider 8164808 YesY
Jmol-3D images Image
Image
PubChem
RTECS nummer BD120000
UNII LMI26O6933 YesY
Properties
Al2O3
Molar mass 101.96 g·mol−1
Appearance white solid
Odour odorless
Density 3.95–4.1 g/cm3
Meltin pynt 2,072 °C (3,762 °F; 2,345 K)[1]
Bylin pynt 2,977 °C (5,391 °F; 3,250 K)[2]
insoluble
Solubility insoluble in diethyl ether
practically insoluble in ethanol
Thermal conductivity 30 W·m−1·K−1[3]
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 clessification Nae listed.
NFPA 704
Flammability code 0: Will nae burn. E.g., watter Health code 1: Exposur would cause irritation but anly minor residual injury. E.g., turpentine Reactivity code 0: Normally stable, even unner fire exposur condeetions, an is nae reactive wi watter. E.g., liquid nitrogen Special hazards (white): no codeNFPA 704 four-colored diamond
Flash pynt non-flammable
US health exposure limits (NIOSH):
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
Except whaur otherwise notit, data are gien for materials in thair staundart state (at 25 °C [77 °F], 100 kPa).
YesY verify (whit is YesYN ?)
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. Patnaik, P. (2002). Handbook of Inorganic Chemicals. McGraw-Hill. ISBN 0-07-049439-8. 
  2. Roew, Raymond (2009). "Handbook of Pharmaceutical Excipients": 11–12.  |contribution= ignored (help)
  3. Material Properties Data: Alumina (Aluminum Oxide). Makeitfrom.com. Retrieved on 2013-04-17.
  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 frae the oreeginal on 10 October 2007. Retrieved 2007-10-27.