Aluminium telluride is an inorganic chemical compound of aluminium and tellurium with the chemical formula Al2Te3.
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| Other names μ-Telluride(ditelluroxo)dialuminium, Dialuminium tritelluride, Aluminium (III) telluride | |
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| ECHA InfoCard | 100.031.751 |
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| Properties | |
| Al2Te3 | |
| Molar mass | 436.76 g/mol |
| Appearance | dark grey to black solid |
| Density | 4.5 g/cm3 |
| Melting point | 895 °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). Infobox references | |
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).
- 2 Al + 3 Te → Al2Te3
Properties
Aluminium telluride is a very air-sensitive dark grey to black solid. It has a band gap of 2.4 eV. The compound decomposes in humid air.
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.
Uses
Aluminium telluride is used in the semiconductor industry. It can also be used to produce hydrogen telluride by reacting with hydrogen chloride.
- Al2Te3 + 6 HCl → 3 H2Te + 2 AlCl3
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