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Title
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Stabilisation of magnetic ordering in by the introduction of
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Author
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Abstract
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| La3Ni2-xCuxB'O-9 (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 P2(1)/n) with two crystallographically-distinct six-coordinate sites, one occupied by a disordered arrangement of Ni2+ and Cu2+ and the other by a disordered similar to 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. |
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Language
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English
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Source (journal)
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Journal of solid state chemistry. - London
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Publication
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London
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2019
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ISSN
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0022-4596
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DOI
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10.1016/J.JSSC.2019.05.006
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Volume/pages
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276
(2019)
, p. 164-172
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ISI
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000473372400023
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Full text (Publisher's DOI)
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Full text (open access)
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