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EXAFS study of PbS-SnS solid solution.

A Lebedev1, I Sluchinskaya, I Munro

  • 1Physics Department, Moscow State University, Russia. swan@mch.chem.msu.su

Journal of Synchrotron Radiation
|August 22, 2001
PubMed
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The local environment of lead (Pb) atoms in Pb(x)Sn(1-x)S solid solutions was investigated. Shorter Pb-S bonds in orthorhombic samples suggest Pb

Area of Science:

  • Solid-state chemistry
  • Materials science
  • Crystallography

Background:

  • Pb(x)Sn(1-x)S is a solid solution with potential applications.
  • Understanding the local atomic environment is crucial for predicting material properties.

Purpose of the Study:

  • To investigate the local atomic environment of Pb atoms in Pb(x)Sn(1-x)S solid solutions.
  • To determine the influence of SnS host on Pb atom's local structure.
  • To explore the short-range order in orthorhombic samples.

Main Methods:

  • Extended X-ray Absorption Fine Structure (EXAFS) technique was employed.
  • Analysis focused on the Pb-S bond length and metal atom distribution in the second shell.

Main Results:

Related Experiment Videos

  • The shortest Pb-S bond length in orthorhombic samples was approximately 0.2 Å shorter than in cubic PbS.
  • The 6s2 lone pair of Pb was found to be stereochemically active in the SnS host.
  • Strong correlations in metal atom distribution indicated significant short-range order in orthorhombic samples.

Conclusions:

  • The observed Pb-S bond shortening confirms the stereochemical activity of the Pb 6s2 lone pair.
  • The strong short-range order in orthorhombic Pb(x)Sn(1-x)S suggests potential for superstructure formation.
  • Future research may focus on superstructures with space groups C(7)2v or C(2)2v.