The Features of Structural Transformations in Lanthanum Manganites La1-xAxMnO3+δ (A = Ca, Sr, Ba)

In this work, the effect of the ionic radius and concentration of a doping element on the features of the structural transformations in polycrystalline lanthanum manganites, La(1-x)A(x)MnO(3+delta) (A = Ca, Sr, Ba), has been studied by Mossbauer spectroscopy and X-ray diffraction analysis. For Mossbauer investigations, a small amount of Fe-57 (2 at%) Mossbauer isotope was introduced into the samples. It follows from the analysis of the obtained data that both common features of the structural transformations and differences between them exist in lanthanum manganites depending on ionic radius and concentration of a doping element.