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Metavalent Bonding in Crystalline Solids: How Does It Collapse?

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Summary

Researchers explored the transition between metavalent and covalent bonds in solids. They found a critical concentration of elements like selenium or antimony causes sudden property changes, impacting materials science.

Keywords:
atom probe tomographybond breakingmaterials by designmetavalent bondingphase-change materialsproperty mapsthermoelectricstopological insulators

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Area of Science:

  • Solid-state chemistry and materials science.
  • Investigation of fundamental chemical bonding types in solids.

Background:

  • The concept of chemical bonding is central to understanding material properties.
  • A novel 'metavalent bond' has been identified in chalcogenides, distinct from covalent, ionic, and metallic bonds.
  • The existence and characteristics of a transition between metavalent and covalent bonding remain an open question.

Purpose of the Study:

  • To investigate the transition between metavalent and covalent bonding.
  • To analyze property changes in pseudo-binary lines (GeTeSe, Sb2Te3Se3x, Bi2-2xSb2xSe3) with varying compositions.
  • To establish a correlation between electron sharing, stoichiometry, and material properties.

Main Methods:

  • Studied three pseudo-binary lines: GeTe1-xSex, Sb2Te3(1-x)Se3x, and Bi2-2xSbxSe3.
  • Monitored changes in optical absorption (ε2(ω)), optical dielectric constant (ε∞), Born effective charge (Z*), and electrical conductivity.
  • Observed bond breaking behavior as a function of selenium or antimony concentration.

Main Results:

  • A sudden transition in multiple properties was observed at a critical concentration of Se or Sb.
  • Evidence suggests a well-defined change in bonding character occurs.
  • Optical properties, electrical conductivity, and Born effective charge are sensitive to this transition.

Conclusions:

  • A clear transition exists between metavalent and covalent bonding in the studied systems.
  • Metavalent bonding significantly influences the properties of phase-change materials and thermoelectrics.
  • Tailoring electron sharing offers a pathway for designing novel optoelectronic materials.