Misplaced Pages

Scandium dodecaboride

Names
IUPAC name scandium dodecaboride
Identifiers
CAS Number	12230-35-2
Properties
Chemical formula	ScB12
Molar mass	174.69 g/mol
Structure
Crystal structure	Tetragonal, tI26
Space group	I4/mmm, No. 139
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). Y verify (what is  ?) Infobox references

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.

Crystallography

ScB₁₂ was originally reported as having a cubic structure, later studies showed it to have tetragonal structure (unit cell with a=522pm, c=735pm). More recently it has been shown that there is indeed a cubic form but that it requires stabilization.

References

1. ^ Matkovich, V.I.; J Economy; R F Giese Jr; R Barrett (1965). "The structure of metallic dodecaborides" (PDF). Acta Crystallogr. 19 (6): 1056–1058. Bibcode:1965AcCry..19.1056M. doi:10.1107/S0365110X65004954. Retrieved 2008-08-28.
2. 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.
3. 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.

• Scandium compounds
• Borides