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Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions. 
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Comment on 'Chemical bonding in phase-change chalcogenides'.

Carlo Gatti1,2, Jean-Yves Raty3

  • 1CNR SCITEC, CNR Istituto di Scienze e Tecnologie Chimiche 'Giulio Natta', Sede Via C. Golgi, 19, 20133 Milano, Italy.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|July 15, 2025
PubMed
Summary
This summary is machine-generated.

This study re-evaluates chemical bonding in phase-change chalcogenides, finding electron-deficient bonds in Ge-Te crystals, contrary to previous claims. This electron deficiency is characteristic of related pseudobinary systems.

Keywords:
3c–2e vs 3c–4e bondsdensities-based and localized orbitals-based descriptorselectron-deficient and electron-rich bondsmulticentre bondingmulticentre interactionsn-centre electron populations mutual fluctuationphase-change materials

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Computational Materials Science

Background:

  • Phase-change chalcogenides are crucial for data storage applications.
  • Understanding their chemical bonding is key to optimizing material properties.
  • Previous studies utilized density functional theory (DFT) and bonding descriptors.

Discussion:

  • A recent study's analysis of chemical bonding in phase-change chalcogenides was based on an inconsistent fragment choice.
  • This inconsistency led to inaccurate conclusions regarding the nature of chemical bonds.
  • Re-analyzing with consistent fragments reveals a different bonding picture.

Key Insights:

  • The chemical bond in Ge-Te crystals is electron-deficient and partially multicenter, featuring a mix of 3-center-2-electron (3c-2e) and 2-center-1-electron (2c-1e) bonds.
  • This contrasts sharply with prior assertions of electron-rich, 3-center-4-electron (3c-4e) bonding.
  • Electron deficiency is a common characteristic across the (GeTe)1-x(Sb2Te3)x pseudobinary system.

Outlook:

  • Accurate characterization of chemical bonding is essential for rational material design.
  • Further investigation into electron-deficient bonding mechanisms could lead to novel phase-change materials.
  • This work provides a corrected foundation for understanding bonding in chalcogenide systems.