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Your current location :Home > Aluminum Sulfide - Al2S3

Aluminum Sulfide - Al2S3

Aluminum Sulfide Granule - Al2S3

Purity - 99.99%,99.999%

Diamension - Granule 1-10mm

Package - Sealed with Vacume

Application -

Aluminum Sulfide Powder - Al2S3

Purity - 99.99%,99.999%

Diamension - 40mesh

Package - sealed with Vacume

Application -

aluminium sulfide is dangersAbout Aluminium Sulfide (Al2S3)

Aluminum sulfide or aluminium sulphide is a chemical compound with the formula Al2S3. This colorless species has an interesting structural chemistry, existing in several forms. The material is sensitive to moisture, hydrolyzing to hydrated aluminium oxides/hydroxides.This can begin when the sulfide is exposed to the atmosphere. The hydrolysis reaction generates gaseous hydrogen sulfide (H2S).

Crystal Structure

More than six crystalline forms of aluminium sulfide are known and only some are listed below. Most of them have rather similar, wurtzite-like structures, and differ by the arrangement of lattice vacancies, which form ordered or disordered sublattices.

Form Symmetry Space
group
a (A) c (A) ρ (g/cm3)
α Hexagonal - 6.423 17.83 2.32
β Hexagonal P63mc 3.579 5.829 2.495
γ Trigonal - 6.47 17.26 2.36
δ Tetragonal I41/amd 7.026 29.819 2.71

The β and γ phases are obtained by annealing the most stable α-Al2S3 phase at several hundred degrees Celsius. Compressing aluminium sulfide to 2–65 kbar results in the δ phase where vacancies are arranged in a superlattice of tetragonal symmetry.

Unlike Al2O3, in which the Al(III) centers occupy octahedral holes, the more expanded framework of Al2S3 stabilizes the Al(III) centers into one third of the tetrahedral holes of a hexagonally close-packed arrangement of the sulfide anions. At higher temperature, the Al(III) centers become randomized to give a "defect wurtzite" structure. And at still higher temperatures stabilize the γ-Al2S3 forms, with a structure akin to γ-Al2O3.

Molecular derivatives of Al2S3 are not known. Mixed Al-S-Cl compounds are however known. Al2Se3 and Al2Te3 are also known.

Preparation
Aluminium sulfide is readily prepared by ignition of the elements
2 Al + 3 S → Al2S3
This reaction is extremely exothermic and it is not necessary or desirable to heat the whole mass of the sulfur-aluminium mixture; (except possibly for very small amounts of reactants). The product will be created in a fused form; it reaches a temperature greater than 1100 °C and may melt its way through steel. The cooled product is very hard.

Basic Information

Chemical formula:Al2S3
Molar mass:150.158 g/mol
Appearance:gray solid
Density:2.02 g/cm3
Melting point:1,100 °C (2,010 °F; 1,370 K)
Boiling point:1,500 °C (2,730 °F; 1,770 K) sublimes
Solubility in water:decomposes
Solubility:insoluble in acetone
Structure
Crystal structure:trigonal
Thermochemistry Specific heat capacity (C):105.1 J/mol K
Std molar entropy (So298):116.9 J/mol K
Std enthalpy of formation (ΔfHo298):-724 kJ/mol

 

 

 

 

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