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Electronic structure of CaCO₃: a Compton scattering study.

S F Mohammed1, F M Mohammad, Jagrati Sahariya

  • 1Department of Physics, College of Education, University of Tikrit, Tikrit, Iraq.

Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine
|December 5, 2012
PubMed
Summary

We studied electron momentum density in calcium carbonate (CaCO₃) using Compton scattering. The generalized gradient approximation (GGA) best matched experimental results, providing insights into its electronic structure.

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Area of Science:

  • Solid-state physics
  • Materials science
  • Computational chemistry

Background:

  • Understanding electron momentum density is crucial for characterizing material properties.
  • Calcium carbonate (CaCO₃) is a widely studied material with diverse applications.

Purpose of the Study:

  • To investigate the electron momentum density of CaCO₃.
  • To compare experimental Compton scattering data with theoretical calculations.
  • To evaluate different approximations within density functional theory for describing CaCO₃.

Main Methods:

  • Compton scattering technique using a (241)Am Compton spectrometer.
  • Theoretical calculations employing the linear combination of atomic orbitals (LCAO) method via CRYSTAL09 code.
  • Application of local density approximation (LDA), generalized gradient approximation (GGA), and second-order GGA (SOGGA) within density functional theory.

Main Results:

  • Experimental Compton profiles were obtained for CaCO₃.
  • Theoretical Compton profiles were computed using LDA, GGA, and SOGGA.
  • The GGA approximation showed the best agreement with the experimental data.
  • Energy bands and density of states for CaCO₃ were calculated and discussed.

Conclusions:

  • The generalized gradient approximation (GGA) accurately describes the electron momentum density of CaCO₃.
  • Compton scattering is a valuable technique for validating theoretical models of electronic structure.
  • The study provides a detailed understanding of the electronic properties of calcium carbonate.