CAS 1344-28-1 Aluminum oxide G - Materials / Alfa Chemistry

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Aluminum oxide G

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Catalog Number

ACM1344281-12

CAS Number

1344-28-1

Product Name

Aluminum oxide G

Structure

Category

Oxides

Description

Aluminum oxide is a white odorless crystalline powder. Water insoluble. Properties (both physical and chemical) vary according to the method of preparation; different methods give different crystalline modifications. The variety formed at very high temperature is quite inert chemically.;DryPowder; DryPowder, OtherSolid; DryPowder, PelletsLargeCrystals; DryPowder, WetSolid; Liquid; OtherSolid; PelletsLargeCrystals; PelletsLargeCrystals, OtherSolid; WetSolid; WetSolid, Liquid;WHITE POWDER.;White, odorless, crystalline powder.;White, odorless, crystalline powder.

IUPAC Name

dialuminum;oxygen(2-)

Molecular Weight

101.961g/mol

Molecular Formula

Al2O3;Al2O3;Al2O3

Canonical SMILES

[O-2].[O-2].[O-2].[Al+3].[Al+3]

InChI

InChI=1S/2Al.3O/q2*+3;3*-2

InChI Key

PNEYBMLMFCGWSK-UHFFFAOYSA-N

Boiling Point

5396 °F at 760 mm Hg (NIOSH, 2016);2977 °C;3000 °C;5396°F;5396°F

Melting Point

3632 °F (NIOSH, 2016);2030 °C;2054 °C;3632°F;3632°F

Density

4 (NIOSH, 2016);Density: 3.4-4.0;3.97 g/cm³;4;4.0

Solubility

Insoluble (NIOSH, 2016);Difficult solubility in mineral acids and strong alkali;Insoluble in water;Solubility in water: none;Insoluble

Application

Aluminum oxide G is primarily designed for applications that exploit its unique physical and chemical properties. As a white crystalline powder, aluminum oxide exhibits significant versatility due to its ability to occur in two primary crystalline forms: α-aluminum oxide with hexagonal crystals and γ-aluminum oxide with cubic crystals, both transforming under high temperatures. Its abundance in nature, particularly in bauxites and laterites, makes it a fundamental resource in various industries. For instance, its utility in the production of precious gems like ruby and sapphire highlights its value. In terms of industrial applications, aluminum oxide's role as an adsorbent stems from its affinity for water and polar molecules, while its extensive surface area and pore structure make it ideal as a catalyst in chemical reactions, such as sulfur recovery and dehydration processes. Its amphoteric nature allows it to interact with both acids and bases, forming various compounds that are beneficial in chemical manufacturing. Furthermore, aluminum oxide's hardness makes it a preferred choice for abrasives, replacing traditional materials due to its enhanced properties. It also serves key roles in pharmaceuticals, being used in tablet formulations, antibiotics, and various therapeutic applications. In essence, Aluminum oxide G serves a multitude of purposes across industries, leveraging its chemical properties and natural abundance to drive innovation and efficiency in various applications.

Color/Form

White crystalline powder;White powder, balls or lumps or various mesh

Complexity

Covalently-Bonded Unit Count

EC Number

215-691-6

Exact Mass

101.947821g/mol

Formal Charge

Heavy Atom Count

ICSC Number

0351

MeSH Entry Terms

Alumina;Alumina Ceramic;Aluminum Oxide;Aluminum Oxide (Al130O40);Aluminum Oxide (Al2O);Aluminum Oxide (AlO2);Bauxite;Ceramic, Alumina;Corundum;Oxide, Aluminum;Sapphire

Monoisotopic Mass

101.947821g/mol

Odor

Odorless

Other Experimental

Very hygroscopic; an electrical insulator, electrical resistivity at 300 °C about 1.2x10+13 ohms-cm; very hard, about 8.8 on Mohs' scale; when heated above 800 °C, becomes insoluble in acid; specific gravity increases from 2.8 to 4.0 when heated above 800 °C;White powder, hexagonal; MP: 2054 °C; BP: 2977 °C; density: 3.99 g/cu cm; insoluble in water, organic solvents; slightly soluble in alkaline solutions /Alpha-alumina/;Soft white powder; transforms to corundum at 1200 °C; density: 3.97 g/cu cm; insoluble in water; soluble in acid; slightly soluble in alkaline solutions /Gamma-alumina/;Heat of formation: -130.0 kJ/mol; Gibbs energy of formation: -159.0 kJ/mol; molar entropy: 259.4 J/mol-K; molar heat capacity at constant pressure: 45.7 J/mol-K at 298.15 K;Vapor pressures: 100 Pa at 2122 °C; 1 kPa at 2351 °C; 10 kPa at 2629 °C; 100 kPa at 2975 °C;Enthalpy of fusion: 111.1 kJ/mol /Alpha-alumina/;Index of refraction: 1.7598 /alpha-alumina/; 1.7598 /gamma-alumina/;Density: 3.97 g/cu cm; Mohs' hardness: 9; index of refraction: 1.761 (alpha), 1.769 (beta) /Corundum/;Ridgeway's hardness scale: 12; Knoop hardness: 21 kN/sq m;Mean specific heat: 795.5 J/kg-K from 25-1,800 °C; thermal conductivity: 10.9 W/m-K at 500 °C, 6.2 W/m-K at 1000 °C; linear thermal expansion coefficient: 8.6/deg C X 10+6, from 20-1000 °C

Refractive Index

Index of refraction: 1.768, 1.760

Rotatable Bond Count

RTECS Number

BD1200000

UNII

LMI26O6933

Vapor Pressure

0 mm Hg (approx) (NIOSH, 2016);1 mm Hg at 2158 °C;0 mmHg (approx);0 mmHg (approx)

MSDS

Download MSDS

COA