The crystal structure of SrLaFeRuO6: A new double perovskite oxide

X-ray powder diffraction and Mössbauer spectroscopy have been used to study the structural and electronic properties of new disordered double perovskite SrLaFeRuO6. Rietveld refinement of the data revealed that the crystal structure of SrLaFeRuO6 is orthorhombic (space group Pbnm). The cell dimensions are: a = 5.5526(2) Å, b = 5.5820(2) Å, and c = 7.8641(3) Å. No evidence of cation ordering was found either in X-ray diffraction or Mössbauer spectroscopy data. Both Sr/La and Fe/Ru were found to be randomly distributed over the 12 coordinated A sites and 6 coordinated B sites of the perovskite structure, respectively. The Mössbauer parameters, quadrupole splitting (Δ = 0.43 mm/s) and isomer shift (δ = 0.38 mm/s) indicate that Fe is present in Fe+3 high spin d5 state.

57Fe Mössbauer spectrum and perspective view of the orthorhombic crystal structure of SrLaFeRuO6. Fe/Ru are at the center of octahedra.Figure optionsDownload as PowerPoint slide