A Metal-Rich Semiconducting Subchalcogenide

  • Author: ChemistryViews.org
  • Published: 18 December 2019
  • Copyright: Wiley-VCH Verlag GmbH & Co. KGaA
  • Source / Publisher: Chemical Science/Royal Society of Chemistry
  • Associated Societies: Royal Society of Chemistry (RSC), UK
thumbnail image: A Metal-Rich Semiconducting Subchalcogenide

Intermetallic compounds and chalcogenides are two very different types of compounds: the former feature metallic bonding and electric conductivity, while the latter are semiconductors with covalent and/or ionic bonds. Metal-rich chalcogenides, or subchalcogenides, fall between these two extremes. Depending on the amount and type of metals, these compounds can be insulators, semiconductors, or semimetals.

Mercouri G. Kanatzidis, Northwestern University, Evanston, IL, USA, and colleagues have synthesized a new semiconducting subchalcogenide compound, Ir6In32S21. The compound was synthesized from solid sulfur and iridium powder in liquid indium at 1000 °C. It was characterized using single-crystal X-ray diffraction. The team found that the compound crystallizes in a new structure type (pictured) in the polar P31m space group. The crystals contain a honeycomb-like structure made up of distorted, singly capped IrIn7 trigonal prisms and distorted IrIn6 octahedra. The sulfur is bonded exclusively to indium in the form of In/S tetrahedra. Indium thus acts as a bridge between its more electronegative counterparts.

Ir6In32S21 is semiconducting with a band gap of 1.48 eV. According to the researchers, this shows that extended metal–metal bonded networks can still lead to semiconducting behavior. The work could provide a basis for a better understanding of semiconducting behavior in subvalent materials.



Article Views: 1107

Sign in Area

Please sign in below

Additional Sign In options

Please note that to comment on an article you must be registered and logged in.
Registration is for free, you may already be registered to receive, e.g., the newsletter. When you register on this website, please ensure you view our terms and conditions. All comments are subject to moderation.

Article Comments - To add a comment please sign in

Bookmark and Share

If you would like to reuse any content, in print or online, from ChemistryViews.org, please contact us first for permission. more


ChemistryViews.org on Facebook

ChemistryViews.org on Twitter ChemistryViews.org on YouTube ChemistryViews.org on LinkedIn Sign up for our free newsletter

Magazine of Chemistry Europe (16 European Chemical Societies)published by Wiley-VCH