Stabilisation of magnetic ordering in La3Ni2-xCuxB’O9 (B’= Sb, Ta, Nb) by the introduction of Cu2+
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Date
2019-08-01
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier
Abstract
La3Ni2-xCuxB’O9 (x = 0.25; B’ = Sb, Ta, Nb: x = 0.5; B’ = Nb) have been synthesized and characterised by transmission electron microscopy, neutron diffraction and magnetometry. Each adopts a perovskite-like structure (space group P21/n) with two crystallographically-distinct six-coordinate sites, one occupied by a disordered arrangement of Ni2+ and Cu2+ and the other by a disordered ∼1:2 distribution of Ni2+ and B′5+, although some Cu2+ is found on the latter site when x = 0.5. Each composition undergoes a magnetic transition in the range 90 ≤ T/K ≤ 130 and shows a spontaneous magnetisation at 5 K; the transition temperature always exceeds that of the x = 0 composition by ≥ 30 K. A long-range ordered G-type ferrimagnetic structure is present in each composition, but small relaxor domains are also present. This contrasts with the pure relaxor and spin-glass behaviour of x = 0, B’ = Ta, Nb, respectively. © 2019 The Authors. This is an open access article under the CC BY license. Published by Elsevier Inc.
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Keywords
Perovskite, Magnetism, Transmission electron microscopy, Neutron diffraction, Ferrimagnetic materials, Transition temperature
Citation
Chin, C.-M., Battle, P. D., Hunter, E. C., Avdeev, M., Hendrickx, M., & Hadermann, J. (2019). Stabilisation of magnetic ordering in La3Ni2-xCuxB’O9 (B’ = Sb, Ta, Nb) by the introduction of Cu2+. Journal of Solid State Chemistry, 276, 164-172, doi:10.1016/j.jssc.2019.05.006