Strain effects and electronic structures of narrow band P-R ferroelectrics: First principles calculation


Bozdag N., Koc H., ŞİMŞEK Ş., Mamedov A. M., Ozbay E.

Ferroelectrics, vol.544, no.1, pp.1-10, 2019 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 544 Issue: 1
  • Publication Date: 2019
  • Doi Number: 10.1080/00150193.2019.1598177
  • Journal Name: Ferroelectrics
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.1-10
  • Keywords: Ab-initio calculations, electronic properties, mechanical properties, optical properties
  • Hakkari University Affiliated: Yes

Abstract

In the present work, the structural, mechanical, electronic and optical properties of the Ruddlesden–Popper(RP) Ba3X2S7 (X = Zr, Hf, Ti) sulfides compounds have been investigated by means of first principles calculations. The generalized gradiend approximation has been used for modeling exchange-correlation effects. It has been observed that the calculated lattice parameters are in good agreement with the experimental values. Bulk modulus, shear modulus, Young’s modulus Poisson’s ratio, and Poisson’s ratio from the calculated elastic constants for Ba3Zr2S7, Ba3Hf2S7, and Ba3Ti2S7 compounds, respectively have been obtained. The obtained electronic band structure for Ba3Zr2S7 and Ba3Hf2S7 compounds are semiconductor in nature, and the Ba3Ti2S7 compound also is metallic. Based on the obtained electronic structures, we further calculated the frequency-dependent dielectric function and other optical functions along the x- and z- axes.