Chemical Formula For Aluminum Sulfite
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| Other names Aluminium sulfide | |
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| ECHA InfoCard | 100.013.736 |
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| Chemical formula | AltwoSiii |
| Molar mass | 150.158 g/mol |
| Appearance | grey solid |
| Density | two.02 g/cm3 |
| Melting signal | 1,100 °C (2,010 °F; one,370 K) |
| Boiling indicate | i,500 °C (2,730 °F; 1,770 Thousand) sublimes |
| Solubility in water | decomposes |
| Solubility | insoluble in acetone |
| Structure | |
| Crystal structure | trigonal |
| Thermochemistry | |
| Oestrus capacity (C) | 105.1 J/mol K |
| Std molar | 116.ix J/mol Grand |
| Std enthalpy of | -724 kJ/mol |
| Hazards | |
| GHS labelling: | |
| Pictograms |   |
| Signal word | Danger |
| NFPA 704 (fire diamond) | 4 0 2 |
| Safety data sheet (SDS) | [ane] |
| Except where otherwise noted, information are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references | |
Aluminum sulfide or aluminium sulphide is a chemic compound with the formula AliiSouthiii. This colorless species has an interesting structural chemical science, existing in several forms. The material is sensitive to moisture, hydrolyzing to hydrated aluminum oxides/hydroxides.[i] This tin begin when the sulfide is exposed to the atmosphere. The hydrolysis reaction generates gaseous hydrogen sulfide (HiiS).
Crystal structure [edit]
More than than vi crystalline forms of aluminum sulfide are known and only some are listed below. Almost of them have rather similar, wurtzite-similar structures, and differ past the arrangement of lattice vacancies, which form ordered or disordered sublattices.[two] [3]
| Form | Symmetry | Space grouping | a (A) | c (A) | ρ (g/cm3) |
|---|---|---|---|---|---|
| α | Hexagonal | P61 | six.423 | 17.83 | 2.32 |
| β | Hexagonal | P63mc | 3.579 | 5.829 | 2.495 |
| γ | Trigonal | 6.47 | 17.26 | two.36 | |
| δ | Tetragonal | I4one/amd | vii.026 | 29.819 | 2.71 |
The β and γ phases are obtained by annealing the most stable α-AliiSouthward3 phase at several hundred degrees Celsius.[4] Compressing aluminum sulfide to 2–65 bar results in the δ phase where vacancies are arranged in a superlattice of tetragonal symmetry.[5]
Unlike Al2Othree, in which the Al(III) centers occupy octahedral holes, the more expanded framework of AliiSthree stabilizes the Al(III) centers into one third of the tetrahedral holes of a hexagonally shut-packed arrangement of the sulfide anions. At higher temperature, the Al(3) centers get randomized to give a "defect wurtzite" construction. And at yet higher temperatures stabilize the γ-AltwoSthree forms, with a structure akin to γ-Al2Othree.
Molecular derivatives of Al2S3 are non known. Mixed Al-Due south-Cl compounds are nevertheless known. Al2Se3 and AltwoTethree are likewise known.
Preparation [edit]
Aluminum sulfide is readily prepared past ignition of the elements[vi]
- 2 Al + 3 South → Al2South3
This reaction is extremely exothermic and it is not necessary or desirable to heat the whole mass of the sulfur-aluminum mixture; (except possibly for very minor amounts of reactants). The product will exist 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 difficult.
References [edit]
- ^ Holleman, A. F.; Wiberg, Due east. "Inorganic Chemistry" Academic Press: San Diego, 2001. ISBN 0-12-352651-5.
- ^ Hans Landolt; D. Bimberg, Richard Börnstein; Richard Börnstein (1982). Halbleiter. Springer. pp. 12–. ISBN978-three-540-13507-4 . Retrieved 23 September 2011.
- ^ Flahaut J. Ann. Chim. (Paris) 7 (1952) 632–696
- ^ Krebs, Bernt; Schiemann, Anke; läGe, Mechtild (1993). "Synthese und Kristallstruktur einer Neuen hexagonalen Modifikation von Al2S3 mit fünffach koordiniertem Aluminum". Zeitschrift für anorganische und allgemeine Chemie. 619 (6): 983. doi:x.1002/zaac.19936190604.
- ^ Donohue, P (1970). "High-pressure spinel blazon Al2S3 and MnAl2S4". Journal of Solid Country Chemistry. ii (i): 6–8. Bibcode:1970JSSCh...2....6D. doi:10.1016/0022-4596(70)90024-1.
- ^ McPherson, William (1913). Laboratory manual. Boston: Ginn and Visitor. p. 445.
Chemical Formula For Aluminum Sulfite,
Source: https://en.wikipedia.org/wiki/Aluminium_sulfide
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