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

A.K. Kundu (1) , M. Yu Mychinko (2, 1, 3) , V. Caignaert (1) , O.I. Lebedev (1) , N.E. Volkova (3) , K.M. Deryabina (3) , V.A. Cherepanov (3) , B. Raveau (1)

1 CRISMAT - Laboratoire de cristallographie et sciences des matériaux
2 LaMIPS - Laboratoire de Microélectronique et de Physique des Semiconducteurs
3 UrFU Institute of Natural Sciences and Mathematics

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.

Keywords: Antiferromagnetic ordering; Cobalto ferrites; Nanoscale ordering; Quintuple perovskites

Domains: Chemical Sciences; Chemical Sciences; Cristallography; Chemical Sciences; Material chemistry; Chemical Sciences; Theoretical and/or physical chemistry

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⟩