Coherent intergrowth of simple cubic and quintuple tetragonal perovskites in the system Nd2-εBa3+ε(Fe,Co)5O15-δ

Abstract : Abstract Investigation of the Nd2-εBa3+ε(Fe,Co)5O15-δ system, combining X-ray diffraction and electron microscopy, has allowed a tetragonal quintuple ordered perovskite "ap×ap×5ap" phasoid inter-grown within a single cubic perovskite matrix to be evidenced for ε=0. This nanoscale chemically twinned perovskite is compared with other members, Ln=Sm, Eu, Pr. The unusual long range ordering of the layers develops strains due to size mismatch between Ba2+ and Ln3+ cations. Importantly, two factors allow the strains to be decreased (i) special intergrowths of double (LnBaFe2O6-δ) and triple (LnBa2Fe3O9-δ) perovskite ribbons/layers oriented at 90°, (ii) nanoscale chemical twinning. The spin locking effect of the nano-domain boundaries upon the magnetic properties of these perovskites is discussed. © 2015 Elsevier Inc.
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Soumis le : lundi 15 juillet 2019 - 18:04:46
Dernière modification le : mercredi 28 août 2019 - 12:50:05

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A.K. Kundu, M. Yu Mychinko, V. Caignaert, O.I. Lebedev, N.E. Volkova, et al.. Coherent intergrowth of simple cubic and quintuple tetragonal perovskites in the system Nd2-εBa3+ε(Fe,Co)5O15-δ. Journal of Solid State Chemistry, 2015, 231, pp.36-41. ⟨10.1016/j.jssc.2015.07.050⟩. ⟨hal-02184123⟩

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