Neutron Diffraction and Mössbauer Spectroscopy Study of Layer Perovskite $LaSrFeO4$ Available to Purchase

The perovskite related Ruddlesden‐Popper phase $LaSrFeO4$ was synthesized by nitrate‐citrate method. Neutron diffraction and Mössbauer spectroscopy were applied for detailed structural study in the temperature interval from 9.3 K to 298 K. The results of Rietveld analysis of diffraction data collected at room temperature confirm the $K2NiF4$—type structure, I4/mmm tetragonal space group, with unit cell parameters $a = b = 3.8694$ Å and $c = 12.7322$ Å. Mössbauer spectroscopy measurements were carried out in the temperature range 9.3–300 K. The complex type of resonance spectra was explained taking into account the random distribution of La and Sr ions from the second coordination sphere of $Fe3+.$