Abstract
Conditions (temperature, oxygen partial pressure in the gas atmosphere, and heating time) for the synthesis of polycrystalline layered manganites Ln2BaMn2O7 – δ (Ln = Pr, Nd) with an orthorhombic structure (Fmmm) and a specific oxygen non-stoichiometry were proposed for the first time. The temperature boundaries for the orthorhombic (Fmmm) to tetragonal (I4/mmm) structural phase transition were determined using high-temperature X-ray diffraction and differential scanning calorimetry. The temperature of the structural transition increases with increasing atomic number of the rare earth metal present in the manganite.
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ACKNOWLEDGMENTS
The authors are grateful to V.M. Dimitrov for the help in conducting the experiment.
Funding
This work was performed within the State Assignment for the Institute of Metallurgy, Ural Branch, Russian Academy of Sciences, using the research equipment of the Center for Collective Use “Ural-M.”
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Vedmid’, L.B., Fedorova, O.M. & Balakirev, V.F. Synthesis Conditions and Structure of Layered Manganites Ln2BaMn2O7 – δ(Ln = Pr, Nd) . Dokl Chem 493, 121–125 (2020). https://doi.org/10.1134/S0012500820380012
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DOI: https://doi.org/10.1134/S0012500820380012