1. Coherent intergrowth of simple cubic and quintuple tetragonal perovskites in the system Nd2−εBa3+ε(Fe,Co)5O15−δ.
- Author
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Kundu, Asish K., Yu Mychinko, Mikhail, Caignaert, Vincent, Lebedev, Oleg I., Volkova, Nadezhda E., Deryabina, Ksenia M., Cherepanov, Vladimir A., and Raveau, Bernard
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PEROVSKITE , *COHERENCE (Physics) , *ANTIFERROMAGNETIC materials , *FERRITES , *CATIONS - Abstract
Investigation of the Nd 2− ε Ba 3+ ε (Fe,Co) 5 O 15− δ system, combining X-ray diffraction and electron microscopy, has allowed a tetragonal quintuple ordered perovskite “ a p × a p × 5a p ” 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 Ba 2+ and Ln 3+ cations. Importantly, two factors allow the strains to be decreased: (i) special intergrowths of double (LnBaFe 2 O 6− δ ) and triple (LnBa 2 Fe 3 O 9− 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. [ABSTRACT FROM AUTHOR]
- Published
- 2015
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