The structural transformations in doped lanthanum manganites La1–xMexMnO3+δ (Me = Ca, Sr, Ba) (with a small amount of 57Fe (2%) for Mössbauer experiments) have been studied in a wide concentration range of a doping element (0 < x < 0.2) by Mössbauer spectroscopy and X-ray diffraction analysis. A mixture of three orthorhombic phases has been shown to be formed in all these compounds of a stoichiometric composition, i.e., a structural phase separation takes place. The phase relations for different doping element types and contents significantly differ. The reasons of phase separation in lanthanum manganites are discussed.
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