Chemistry:Aluminium dodecaboride
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| Names | |
|---|---|
| IUPAC name
Aluminium dodecaboride
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| Other names
AlB12
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| Identifiers | |
3D model (JSmol)
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| EC Number |
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PubChem CID
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| Properties | |
| AlB 12 | |
| Molar mass | 156.714 g/mol[1] |
| Appearance | Yellow to black solid[1] |
| Density | 2.55 g/cm3[1] |
| Melting point | 2,070 °C (3,760 °F; 2,340 K)[1] |
| insoluble | |
| Solubility | soluble in hot nitric acid (decomposes),[2] soluble in nitric acid (decomposes),[3] soluble in sulfuric acid (decomposes)[3] |
| Structure | |
| Tetragonal (α-form) Orthorhombic (β-form) | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
 verify (what is   ?)
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| Infobox references | |
Aluminium dodecaboride (AlB
12) is a superhard chemical compound with 17% aluminium content by weight.
It is the hardest boride of the aluminium-boron system, which also includes AlB
10, AlB
4, AlB
2 and AlB.
Properties
There are two crystalline forms, α-AlB
12, and γ-AlB
12. Both forms are very similar and consist of a framework with three-dimensional networks of B
12 and B
20 units.[4] The phase β-AlB
12 is now believed to be the ternary boride C
2Al
3B
48.[5]
Preparation
The β-form can be prepared by the reaction of boron(III) oxide with sulfur and aluminium, then adding carbon to the mixture.
Uses
The extreme hardness of AlB
12 makes it a favorable component of PCBN inserts, which are mainly used in cutting and grinding to replace diamond or corundum.
See also
- Boron
- Aluminium boride
Footnotes
- ↑ 1.0 1.1 1.2 1.3 Haynes, William M., ed (2011). CRC Handbook of Chemistry and Physics (92nd ed.). Boca Raton, FL: CRC Press. p. 4.45. ISBN 1439855110.
- ↑ Martienssen, Werner; Warlimont, Hans (2005). Springer Handbook of Condensed Matter and Materials Data. Springer-Verlag. pp. 1025. ISBN 9783540443766. Bibcode: 2005shcm.book.....M.
- ↑ 3.0 3.1 Rebekoff Reeve, Martin (1991) Method of producing an aluminium boride. EP 0130016 B1
- ↑ Higashi, Iwami (2000). "Crystal chemistry of α-AlB12 and γ-AlB12". Journal of Solid State Chemistry 154 (1): 168–176. doi:10.1006/jssc.2000.8831. Bibcode: 2000JSSCh.154..168H.
- ↑ Matkovich, V. I; Giese, R. F; Economy, J (1965). "Phases and twinning in C2Al3B48 (β-AlB12)". Zeitschrift für Kristallographie 122 (1–2): 108. doi:10.1524/zkri.1965.122.1-2.108. Bibcode: 1965ZK....122..108M.
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