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Electric Fields Produced by a Charge Density in Ionic Crystals.

Herbert S Bennett1

  • 1Institute for Materials Research, National Bureau of Standards, Washington, D.C. 20234.

Journal of Research of the National Bureau of Standards. Section A, Physics and Chemistry
|December 12, 2019
PubMed
Summary
This summary is machine-generated.

Extended defects, like F centers, create charge densities that induce crystal polarization. This study calculates the electric field contributions from ionic shells around defects in NaCl and CaF2 structures.

Keywords:
CaF2NaCldipole shell coefficientelectric fieldspolarizationspatially extended defects

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Area of Science:

  • Solid-state physics
  • Materials science
  • Crystallography

Background:

  • Spatially extended defects, such as F centers, introduce effective charge densities within crystals.
  • These charge densities can lead to significant crystal polarization.
  • The resulting electric fields are influenced by induced dipoles.

Purpose of the Study:

  • To evaluate the contribution of ionic shells around defects to the electric field.
  • To analyze these contributions in specific crystal structures.

Main Methods:

  • Lattice summation techniques were employed.
  • Calculations were performed for sodium chloride (NaCl) and calcium difluoride (CaF2) lattice structures.

Main Results:

  • The study provides a quantitative assessment of electric field contributions from ionic shells around defects.
  • Specific results are detailed for NaCl and CaF2.

Conclusions:

  • The methodology allows for the calculation of electric fields induced by extended defects.
  • Understanding these fields is crucial for predicting material properties and behaviors.