Indium (II) selenide

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Crystal structure
Crystal structure of indium (II) selenide
__ In 2+      __ Se 2−

Crystal structure of the γ form of indium (II) selenide

General
Surname Indium (II) selenide
Ratio formula InSe
Brief description

black crystals

External identifiers / databases
CAS number 1312-42-1
Wikidata Q971847
properties
Molar mass 193.78 g mol −1
Physical state

firmly

Melting point

660 ° C

safety instructions
GHS hazard labeling
no classification available
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Indium (II) selenide (InSe) is a chemical compound of indium and selenium , a so-called III-VI semiconductor . In 2 Se 3 , In 4 Se 3 and In 6 Se 7 are to be distinguished from InSe .

Extraction and presentation

The substance can be obtained by reacting indium with selenium.

properties

Indium (II) selenide is a black, matt, greasy, glossy, easily friable solid. It's polymorphic . β-InSe crystallizes in the space group P 6 3 / mmc (space group no.194 ) , ε-InSe in the space group P 6 m 2 (no. 187) and γ-InSe in the space group R 3 m ( no.160 ) . A polymorph in the space group P 6 3 22 (No. 182) is also described. The dominant phase is the γ form. The lattice parameters of the γ-form are a = 4.002 Å and c = 24.95 Å. The structure consists of In 2 4+ cations, which are bound to neighboring cations by bridging selenium atoms, so that a layered structure results. The layered structure results in two band transitions , an indirect band transition with a band gap energy of approx. 1.2  eV and a direct band transition with approx. 2.4 eV. Template: room group / 194Template: room group / 187Template: room group / 160Template: room group / 182

literature

  • R. Clasen, O. Madelung: Semiconductors. Physics of Non-tetrahedrally Bonded Binary Compounds II . In Landolt-Börnstein numerical data and functional relationships in science and technology. New series. Group III, Crystal and solid state physics . Volume 17, Springer, ISBN 3-540-12160-9 ( limited preview in Google book search)

Individual evidence

  1. ↑ a b c Entry on indium selenide. In: Römpp Online . Georg Thieme Verlag, accessed on July 15, 2014.
  2. ↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.
  3. ↑ a b Georg Brauer (Ed.), With the collaboration of Marianne Baudler u a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume I, Ferdinand Enke, Stuttgart 1975, ISBN 3-432-02328-6 , p. 872.
  4. ↑ T. Ikari, S. Shigetomi, K. Hashimoto: Crystal Structure and Raman Spectra of InSe. In: Basic Solid State Physics , 111 (2), 1982, pp. 477-481, doi: 10.1002 / pssb.2221110208 .
  5. ↑ S. Inoue, T. Yoshida, T. Morita: Crystal Structure of InSe Grown from Melt and Its Structure Transition. In: Japanese Journal of Applied Physics , 21 (2), 1982, pp. 242-248.
  6. ↑ JA Hollingsworth, DM Poojary, A. Clearfield, WE Buhro: Catalyzed Growth of a Metastable InS Crystal Structure as Colloidal Crystals. In: Journal of the American Chemical Society , 122, 2000, pp. 3562-3563, doi: 10.1021 / ja000106u .
  7. ↑ J. Rigoult, A. Rimsky: Refinement of the 3R γ-indium Monoselenide StructureType. In: Acta Crystallographica , B36, 1980, pp. 916-918, doi: 10.1107 / S0567740880004840 .
  8. ↑ John Vincent McCanny , RB Murray: The band structures of gallium and indium selenide. In: Journal of Physics C: Solid State Physics. 1977, No. 10, 1977, pp. 1211-1222, doi: 10.1088 / 0022-3719 / 10/8/022