Scandium dodecaboride
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| Names | |
|---|---|
| IUPAC name
scandium dodecaboride
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| Identifiers | |
| Properties | |
| ScB12 | |
| Molar mass | 174.69 g/mol |
| Structure | |
| Tetragonal, tI26 | |
| I4/mmm, No. 139 | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Scandium dodecaboride is a refractory metal boride.
Synthesis
ScB12 is formed by mixing a 7:1 ratio of boron powder and scandium oxide powder, heating to 2500 °C with a plasma torch or similar, quenching in cold water and washing with concentrated hydrochloric acid.[1]
Crystallography
ScB12 was originally reported as having a cubic structure,[2] later studies showed it to have tetragonal structure (unit cell with a=522pm, c=735pm).[1] More recently it has been shown that there is indeed a cubic form but that it requires stabilization.[3]
References
- ^ a b Matkovich, V.I.; J Economy; R F Giese Jr; R Barrett (1965). "The structure of metallic dodecaborides" (PDF). Acta Crystallogr. 19 (6): 1056–1058. doi:10.1107/S0365110X65004954. Retrieved 2008-08-28.
- ^ Przybylska, Maria; Allan H. Reddoch; George J. Ritter (1963). "The Preparation and Structure of Lutetium Diboride, Scandium Dodecaboride and Lutetium Antimonide". J. Am. Chem. Soc. 85 (4): 407–411. doi:10.1021/ja00887a008.
- ^ Paderno, Y.; N. Shitsevalova (1995). "Stabilization of cubic scandium dodecaboride". Journal of Alloys and Compounds. 219 (1–2): 119–123. doi:10.1016/0925-8388(94)05048-1.