Aluminium telluride
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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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Chemical formula | Al2Te3 |
Molar mass | 436.76 g/mol |
Appearance | dark grey to black solid[1] |
Density | 4.5 g/cm3[1] |
Melting point | 895[2] °C (1,643 °F; 1,168 K) |
Solubility in water | decomposes |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references |
Aluminium telluride is an inorganic chemical compound of aluminium and tellurium with the chemical formula Al2Te3.
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
References
- ^ a b c d e Dale L. Perry (2016). Handbook of Inorganic Compounds. CRC Press. ISBN 978-1-4398-1462-8. Retrieved 2024-07-28 – via Google Books.
- ^ 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.
- ^ a b 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.
- ^ 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.
- ^ 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.
- ^ Riedel, Erwin; Janiak, Christoph (2022). Anorganische Chemie. De Gruyter. ISBN 978-3-11-069458-1 – via Google Books.
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H2Te -TeH | He | ||||||||||||||||||||
Li2Te | BeTe | B | CTe2 (CH3)2Te | (NH4)2Te | O | F | Ne | ||||||||||||||
Na2Te | MgTe | Al2Te3 | Si | P0.8Te0.2 | S | Cl | Ar | ||||||||||||||
K2Te | CaTe | Sc2Te3 | Ti | VTe2 | CrTe Cr2Te3 | MnTe MnTe2 | FeTe | CoTe | NiTe | Cu2Te CuTe CuTe2 | ZnTe | GaTe Ga2Te3 -Ga | GeTe -Ge | As2Te3 As4Te3 +As | Se | +Br | Kr | ||||
Rb2Te | SrTe | Y2Te3 | ZrTe5 | NbTe2 | MoTe2 | Tc | Ru | Rh | Pd | Ag2Te | CdTe | In2Te3 | SnTe SnTe2 | Sb2Te3 | Te2- Te2- n | I | Xe | ||||
Cs2Te | BaTe | * | LuTe Lu2Te3 | HfTe5 | TaTe2 | WTe2 WTe3 | ReTe2 | Os | Ir | Pt | AuxTey | HgTe | Tl2Te | PbTe | Bi2Te3 | Po | At | Rn | |||
Fr | RaTe | ** | Lr | Rf | Db | Sg | Bh | Hs | Mt | Ds | Rg | Cn | Nh | Fl | Mc | Lv | Ts | Og | |||
* | LaTe La2Te3 | CeTe Ce2Te3 | PrTe Pr2Te3 | NdTe Nd2Te3 | Pm | SmTe Sm2Te3 | EuTe Eu2Te3 | GdTe Gd2Te3 | TbTe Tb2Te3 | DyTe Dy2Te3 | HoTe Ho2Te3 | ErTe Er2Te3 | TmTe Tm2Te3 | YbTe Yb2Te3 | |||||||
** | Ac | ThTe2 | Pa | UTe2 | Np | Pu | Am | Cm | Bk | Cf | Es | Fm | Md | No |