Effect of the Cation Size Disorder at the A-Site on the Structural Properties of SrAFeTiO₆ Double Perovskites (A = La, Pr or Nd)

Abdelrahman A. Elbadawi^1*, O. A. Yassin^1,2, Mohamed A. Siddig¹

¹Department of Physics, Faculty of Science and Technology, Alneelain University, Khartoum, Sudan.
²Department of Physics, Faculty of Science, Tiabah University, Medina, Saudi Arabia.

DOI: 10.4236/msce.2015.35003                

Abstract

In this paper, the cation size disorder effect of the A-site on the structural properties of the SrAFe- TiO₆ (A = La, Pr or Nd) was investigated. The compounds were synthesized—as the best of our knowledge—for the first time by conventional and precursor method to get crystalline materials. The results obtained from the experimental measurements carried out on new double perovskite materials were presented. The data of X-ray diffraction (XRD), Fourier Transform Infra Red FTIR were measured at room temperature. From the X-ray diffraction, and by means of standard Rietiveld method, all the samples have the same structure (orthorhombic) with Pnma space group. The difference in the tolerance factor is clearly noticed and refers to the cation size disorder at the A-sites. The Fourier Transform Infra Red FTIR measurement has been done; the results of it confirm the double perovskite structure and the difference between the samples were noticed. The tolerance factors for the samples altered from SrLaFeTiO₆ up to SrNdFeTiO₆ and this difference return to ionic radius and cation size effect.

Keywords

Cation Disorder, Double Perovskite, Tolerance Factor

Conflicts of Interest

The authors declare no conflicts of interest.

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