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Revision as of 09:25, 4 June 2015
| Names | |
|---|---|
| IUPAC name
Aluminium dodecaboride
| |
| Other names
Aluminium boride
| |
| Identifiers | |
| ECHA InfoCard | 100.031.737 |
| EC Number |
|
| Properties | |
| AlB12 | |
| Molar mass | 156.714 g/mol |
| Appearance | Yellow to black solid |
| Density | 2.56 g/cm3 |
| Melting point | 2,200 °C (3,990 °F; 2,470 K) |
| insoluble | |
| 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).
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Aluminium dodecaboride (AlB12) is a chemical compound made from the metal aluminium and the non-metal boron. It is one of two chemical compounds that are commonly called aluminium boride; the other is aluminium diboride, AlB2.
Properties
There are two crystalline forms, α-AlB12, and γ-AlB12. Both forms are very similar and consist of a framework with three-dimensional networks of B12 and B20 units.[1] The phase β-AlB12 is now believed to be the ternary boride C2Al3B48.[2]
Preparation
The β-form can be prepared by the reaction of boron(III) oxide with sulfur and aluminum, then adding carbon to the mixture.
Uses
AlB12 is used as a grinding compound to replace diamond or corundum.
See also
Footnotes
- ^ Crystal chemistry of α-AlB12 and γ-AlB12., Higashi, Iwami; Journal of solid state chemistry 2000, vol. 154, no 1, 168-176,doi:10.1006/jssc.2000.8831
- ^ Phases and twinning in C2Al3B48 (β-AlB12), Matkovich V. I. , Giese R. F. ; Economy J. Z. Krist. 122, 108-15. (1965)
External links