Aluminium dodecaboride

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Aluminium dodecaboride
CAS number 12041-54-2
EC number 234-924-2
Molecular formula 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)
Solubility in water insoluble
Crystal structure Tetragonal (α-form)
Orthorhombic (β-form)
Except where noted otherwise, 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.


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]


The β-form can be prepared by the reaction of boron(III) oxide with sulfur and aluminum, then adding carbon to the mixture.


AlB12 is used as a grinding compound to replace diamond or corundum.

See also[edit]


  1. ^ 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
  2. ^ Phases and twinning in C2Al3B48 (β-AlB12), Matkovich V. I. , Giese R. F. ; Economy J. Z. Krist. 122, 108-15. (1965)

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