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Finite Element Modelling of a Cellular Electric Microenvironment
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Structural models of FeSe(x).

E Z Kurmaev1, J A McLeod, N A Skorikov

  • 1Institute of Metal Physics, Russian Academy of Sciences-Ural Division, 620219 Yekaterinburg, Russia.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|August 12, 2011
PubMed
Summary
This summary is machine-generated.

Investigating iron selenide (FeSe) structures reveals that excess iron, not selenium vacancies, better explains experimental data. This excess iron boosts 3d states at the Fermi level, potentially forming iron clusters in highly non-stoichiometric samples.

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Chemistry

Background:

  • Non-stoichiometric iron selenide (FeSe(x)) exhibits complex structural properties.
  • Understanding these structures is crucial for predicting material behavior.

Purpose of the Study:

  • To compare two structural models for non-stoichiometric FeSe(x).
  • To correlate structural models with soft x-ray spectroscopy findings.
  • To elucidate the impact of non-stoichiometry on electronic properties.

Main Methods:

  • Soft x-ray spectroscopy was employed to analyze FeSe(x) samples (x = 0.85, 0.50).
  • Experimental data was compared against two distinct structural models: interstitial iron and selenium vacancies.

Main Results:

  • A structural model incorporating interstitial iron provided a better fit to experimental soft x-ray spectroscopy data.
  • Excess interstitial iron was found to increase the density of 3d states at the Fermi level.
  • Evidence suggests that high Fe:Se ratios, like in FeSe(0.50), lead to the formation of pure iron clusters.

Conclusions:

  • The interstitial iron model is more accurate for describing non-stoichiometric FeSe(x).
  • Interstitial iron plays a significant role in the electronic structure near the Fermi level.
  • Phase separation into iron clusters occurs in highly iron-rich FeSe(x) materials.