Aluminium telluride

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Aluminium telluride
Names
Other names
μ-Telluride(ditelluroxo)dialuminium, Dialuminium tritelluride, Aluminium (III) telluride
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.031.751 OOjs UI icon edit-ltr-progressive.svg
EC Number
  • 234-939-4
PubChem CID
  • InChI=1S/2Al.3Te Yes check.svgY
    Key: RETRTUZSQWNRQG-UHFFFAOYSA-N Yes check.svgY
  • InChI=1S/2Al.3Te/q2*+3;3*-2
    Key: IBHHFWUKPAWXSJ-UHFFFAOYSA-N
  • [Te]=[Al][Te][Al]=[Te]
Properties
Al2Te3
Molar mass 436.76 g/mol
Appearancedark grey to black solid [1]
Density 4.5 g/cm3 [1]
Melting point 895 [2]  °C (1,643 °F; 1,168 K)
decomposes
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Aluminium telluride is an inorganic chemical compound of aluminium and tellurium with the chemical formula Al2Te3.

Contents

Preparation

Aluminium telluride can be obtained by direct combination of aluminium metal with elemental tellurium at 1,000 °C (1,270 K; 1,830 °F). [1]

2 Al + 3 Te → Al2Te3

Properties

Aluminium telluride is a very air-sensitive [3] dark grey to black solid. [1] It has a band gap of 2.4 eV. [4] The compound decomposes in humid air. [5] .

In its pure form, it occurs in at least two phases. The orange-red low-temperature (α) modification transforms into the yellow high-temperature (β) form at 720 °C (993 K; 1,328 °F). The conversion from β- to α-Al2Te3, which is associated with such a small enthalpy change that it cannot be observed with differential thermal analysis, takes place after prolonged annealing just below the conversion point. The α form crystallizes in the monoclinic crystal system with the lattice constants a = 13.885 Å, b = 7.189 Å, c = 4.246 Å, p = 90.21° and an additional superstructure. The β form has a monoclinic crystal structure with space group P21/c and the lattice constants a = 7.181(1) Å, b = 12.848(3) Å, c = 14.167(3) Å, and b= 90.04(2)°. This form represents a separate structure type. The tellurium atoms form a hexagonal dense packing parallel to the (001) plane; one-third of the tetrahedral vacancies are occupied by aluminium atoms, whereby the tetrahedral vacancies are occupied in such a way that a layered structure is formed. Some sources also report another form of the defect wurtzite type. [3]

Uses

Aluminium telluride is used in the semiconductor industry. [1] It can also be used to produce hydrogen telluride by reacting with hydrogen chloride. [6]

Al2Te3 + 6 HCl → 3 H2Te + 2 AlCl3

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References

  1. 1 2 3 4 5 Dale L. Perry (2016). Handbook of Inorganic Compounds . CRC Press. ISBN   978-1-4398-1462-8 . Retrieved 2024-07-28– via Google Books.
  2. ↑ N. Prabhu, J. M. Howe (1990). "The Al-Te (Aluminum-Tellurium) system". Bulletin of Alloy Phase Diagrams. 11 (2): 202–206. doi:10.1007/BF02841706.
  3. 1 2 Conrad, O; Schiemann, A; Krebs, B (1997). "Die Kristallstruktur von β-Al2Te3" [The Crystal Structure of β-Al2Te3]. Zeitschrift für anorganische und allgemeine Chemie (in German). 623: 1006–1010. doi:10.1002/zaac.199762301157.
  4. ↑ Batsanov, Stepan S.; Batsanov, Andrei S. (2012). Introduction to Structural Chemistry. Springer Netherlands. p. 130. ISBN   978-94-007-4771-5 . Retrieved 2024-07-17– via Google Books.
  5. ↑ Brauer, Georg (2 December 2012). Handbook of Preparative Inorganic Chemistry V1. Elsevier Science. p. 826. ISBN   978-0-323-16127-5 . Retrieved 2024-07-17– via Google Books.
  6. ↑ Riedel, Erwin; Janiak, Christoph (2022). Anorganische Chemie. De Gruyter. ISBN   978-3-11-069458-1 – via Google Books.
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