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| IUPACName = |
| IUPACName = Aluminium dodecaboride |
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| OtherNames = |
| OtherNames = AlB<sub>12</sub> |
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|Section1={{Chembox Identifiers |
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| InChI |
| InChI=1S/Al.12B |
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| InChIKey = |
| InChIKey = JXOOCQBAIRXOGG-UHFFFAOYSA-N |
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| StdInChI_Ref = {{stdinchicite|changed|chemspider}} |
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| CASNo_Ref = {{cascite|correct|??}} |
| CASNo_Ref = {{cascite|correct|??}} |
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| CASNo = 12041-54-2 |
| CASNo = 12041-54-2 |
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| PubChem = |
| PubChem = 6336895 |
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| SMILES = [B].[B].[B].[B].[B].[B].[B].[B].[B].[B].[B].[B].[Al] |
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| EINECS = 234-924-2 |
| EINECS = 234-924-2 |
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|Section2={{Chembox Properties |
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| Formula = {{chem2|AlB12}} |
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| MolarMass = 156.714 g/mol<ref name=b92>{{RubberBible92nd|page=4.45}}</ref> |
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| Appearance = Yellow to black solid<ref name=b92/> |
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| Density = 2.55 g/cm<sup>3</sup><ref name=b92/> |
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| MeltingPtC = 2070 |
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| MeltingPt_ref = <ref name=b92/> |
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| Solubility = insoluble |
| BoilingPt = |
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| Solubility = insoluble |
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| SolubleOther = soluble in hot [[nitric acid]] (decomposes),<ref>{{cite book|isbn=9783540443766|title=Springer Handbook of Condensed Matter and Materials Data|pages=1025|year=2005|editor1=Martienssen, Werner|editor2=Warlimont, Hans|publisher=Springer-Verlag|bibcode=2005shcm.book.....M|last1=Martienssen|first1=Werner|last2=Warlimont|first2=Hans}}</ref><br>soluble in [[nitric acid]] (decomposes),<ref name=r1>Rebekoff Reeve, Martin (1991) [http://www.google.com/patents/EP0130016B1?cl=en Method of producing an aluminium boride]. EP 0130016 B1</ref><br>soluble in [[sulfuric acid]] (decomposes)<ref name=r1/> |
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|Section3={{Chembox Structure |
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| CrystalStruct = Tetragonal (α-form) <br> Orthorhombic (β-form) |
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|Section7={{Chembox Hazards |
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'''Aluminium dodecaboride''' ({{chem2|AlB12}}) is a [[superhard]] [[chemical compound]] with 17% [[aluminium]] content by weight. |
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'''Aluminium dodecaboride''' (AlB<sub>12</sub>) 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]], AlB<sub>2</sub>. |
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It is the hardest boride of the aluminium-boron system, which also includes {{chem2|AlB10}}, {{chem2|AlB4}}, [[Aluminium diboride|{{chem2|AlB2}}]] and AlB. |
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==Properties== |
==Properties== |
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There are two crystalline forms, α- |
There are two crystalline forms, α-{{chem2|AlB12}}, and γ-{{chem2|AlB12}}. Both forms are very similar and consist of a framework with three-dimensional networks of {{chem2|B12}} and {{chem2|B20}} units.<ref>{{cite journal|title=Crystal chemistry of α-AlB<sub>12</sub> and γ-AlB<sub>12</sub>|journal=Journal of Solid State Chemistry |volume=154 |issue=1 |pages=168–176 |year= 2000|doi=10.1006/jssc.2000.8831|last1=Higashi |first1=Iwami |bibcode=2000JSSCh.154..168H }}</ref> The phase β-{{chem2|AlB12}} is now believed to be the ternary boride {{chem2|C2Al3B48}}.<ref>{{cite journal|title=Phases and twinning in C<sub>2</sub>Al<sub>3</sub>B<sub>48</sub> (β-AlB<sub>12</sub>)|journal=Zeitschrift für Kristallographie|volume=122|issue=1–2|pages=108|doi=10.1524/zkri.1965.122.1-2.108|bibcode=1965ZK....122..108M|year=1965|last1=Matkovich|first1=V. I|last2=Giese|first2=R. F|last3=Economy|first3=J}}</ref> |
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==Preparation== |
==Preparation== |
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The β-form can be prepared by the reaction of [[boron(III) oxide]] with [[sulfur]] and [[ |
The β-form can be prepared by the reaction of [[boron(III) oxide]] with [[sulfur]] and [[aluminium]], then adding [[carbon]] to the mixture. |
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==Uses== |
==Uses== |
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The extreme hardness of {{chem2|AlB12}} makes it a favorable component of [[Boron nitride#Cubic BN|PCBN]] inserts, which are mainly used in cutting and grinding to replace [[diamond]] or [[corundum]]. |
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==See also== |
==See also== |
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* [[ |
* [[Boron]] |
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* [[Aluminium boride]] |
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==Footnotes== |
==Footnotes== |
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{{Reflist}} |
{{Reflist}} |
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| ⚫ | |||
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{{Aluminium compounds}} |
{{Aluminium compounds}} |
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{{Borides}} |
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[[Category:Borides]] |
[[Category:Borides]] |
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Latest revision as of 19:54, 26 August 2023
| Names | |
|---|---|
| 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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Aluminium dodecaboride (AlB12) is a superhard chemical compound with 17% aluminium content by weight.
It is the hardest boride of the aluminium-boron system, which also includes AlB10, AlB4, AlB2 and AlB.
Properties[edit]
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]
Preparation[edit]
The β-form can be prepared by the reaction of boron(III) oxide with sulfur and aluminium, then adding carbon to the mixture.
Uses[edit]
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.
See also[edit]
Footnotes[edit]
- ^ a b c d Haynes, William M., ed. (2011). CRC Handbook of Chemistry and Physics (92nd ed.). Boca Raton, FL: CRC Press. p. 4.45. ISBN 1-4398-5511-0.
- ^ Martienssen, Werner; Warlimont, Hans (2005). Martienssen, Werner; Warlimont, Hans (eds.). Springer Handbook of Condensed Matter and Materials Data. Springer-Verlag. p. 1025. Bibcode:2005shcm.book.....M. ISBN 9783540443766.
- ^ a b 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. Bibcode:2000JSSCh.154..168H. doi:10.1006/jssc.2000.8831.
- ^ Matkovich, V. I; Giese, R. F; Economy, J (1965). "Phases and twinning in C2Al3B48 (β-AlB12)". Zeitschrift für Kristallographie. 122 (1–2): 108. Bibcode:1965ZK....122..108M. doi:10.1524/zkri.1965.122.1-2.108.