Scandium oxide
| Scandium(III) oxide | |
|---|---|
|
Other names
Scandia, scandium sesquioxide |
|
| Identifiers | |
| CAS number | 12060-08-1  |
| PubChem | 4583683 |
| Properties | |
| Molecular formula | Sc2O3 |
| Molar mass | 137.91 g/mol |
| Density | 3.86 g/cm3 |
| Melting point |
2485 °C |
| Solubility in other solvents | Insoluble |
| Hazards | |
| NFPA 704 |
 0
1
0
|
 (verify) (what is:  / ?)Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) |
|
| Infobox references | |
Scandium(III) oxide, Sc2O3, scandia is a high melting white solid used in high-temperature systems (for its resistance to heat and thermal shock), electronic ceramics, and glass composition (as a helper material).
[edit] Physical and chemical properties
Scandium(III) oxide has the C-M2O3 structure like the α-Mn2O3 which contains 6- coordinate metal centers.[1] Scandium(III) oxide can be prepared by igniting the metal.[2]
- Sc2O3 is amphoteric, dissolving in acids and alkalis.[2]
It is converted into scandium(III) chloride by reaction with excess aqueous HCl or aqueous HCl/NH4Cl mixtures.[citation needed]
- Sc2O3 + 6 HCl → 2 ScCl3 + 3 H2O
With alkalis it forms scandate salts, unlike its higher homologues yttrium oxide and lanthanum oxide, for example forming K3Sc(OH)6 with KOH. In this, scandium shows more similarity with aluminium oxide.[2]
It is converted into the Lewis acid scandium(III) triflate by reaction with triflic acid.[3]
[edit] References
- ^ Wells A.F. (1984) Structural Inorganic Chemistry 5th edition Oxford Science Publications ISBN 0-19-855370-6
- ^ a b c S.A.Cotton, Scandium, Yttrium and the Lanthanides:Inorganic and Coordination Chemistry, Encyclopedia of Inorganic Chemistry, 1994, John Wiley & Sons, ISBN 0471936200
- ^ McCleverty, J.A. and Meyer, T.J., Comprehensive Coordination Chemistry II, 2003, Elsevier Science, ISBN 0080437486, Vol. 3, p. 99 ["Refluxing scandium oxide with triflic acid leads to the isolation of hydrated scandium triflate"]
[edit] External links
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