Scandium(III) sulfide | |
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Other names
scandium sesquisulfide |
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Identifiers | |
CAS number | 12166-29-9 |
Properties | |
Molecular formula | Sc2S3 |
Molar mass | 186.11 g/mol |
Appearance | yellow crystals |
Density | 2.91 g/cm³, solid |
Melting point |
1775°C |
Structure | |
Crystal structure | orthorhombic |
Hazards | |
EU classification | not listed |
(verify) (what is: / ?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) |
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Infobox references |
Scandium(III) sulfide is a chemical compound of scandium and sulfur with the chemical formula Sc2S3.
Contents[hide] |
The crystal structure of Sc2S3 is closely related to that of sodium chloride, in that it is based on a cubic close packed array of anions. Whereas NaCl has all the octahedral interstices in the anion lattice occupied by cations, Sc2S3 has one third of them vacant. The vacancies are ordered, but in a very complicated pattern, leading to a large, orthorhombic unit cell belonging to the space group Fddd.[1]
The normal way to make metal sulfides is simply to mix the two elements and heat them, but in the case of scandium, this method yields scandium monosulfide, ScS. Sc2S3 can be prepared by heating scandium(III) oxide and hydrogen sulfide in a graphite crucible to 1550 °C or above for 2–3 hours.[1]
Above 1100 °C, Sc2S3 loses sulfur, forming nonstoichiometric compounds such as Sc1.37S2.[1]
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