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Chemical compound From Wikipedia, the free encyclopedia
Aluminium dodecaboride (AlB12) is a superhard chemical compound with 17% aluminium content by weight.
Names | |
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IUPAC name
Aluminium dodecaboride | |
Other names
AlB12 | |
Identifiers | |
3D model (JSmol) |
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ECHA InfoCard | 100.031.737 |
EC Number |
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PubChem CID |
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Properties | |
AlB12 | |
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).
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It is the hardest boride of the aluminium-boron system, which also includes AlB10, AlB4, AlB2 and AlB.
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.[4] The phase β-AlB12 is now believed to be the ternary boride C2Al3B48.[5]
The β-form can be prepared by the reaction of boron(III) oxide with sulfur and aluminium, then adding carbon to the mixture.
The extreme hardness of AlB12 makes it a favorable component of PCBN inserts, which are mainly used in cutting and grinding to replace diamond or corundum.
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