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Title
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and (A = Ca, Sr, Ba) : cation-ordered, inhomogeneous, ferrimagnetic perovskites
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Author
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Abstract
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| Polycrystalline samples of CaLa2FeCoSbO9 and ALa2FeNiSbO9 (A = Ca, Sr, Ba) have been prepared in solid-state reactions and studied by a combination of transmission electron microscopy, magnetometry, X-ray diffraction, neutron diffraction and Mössbauer spectroscopy. Diffraction and TEM showed that each shows 1:1 B-site ordering in which Co2+/Ni2+ and Sb5+ tend to occupy two distinct crystallographic sites while Fe3+ is distributed over both sites. While X-ray and neutron diffraction agreed that all four compositions are monophasic with space group P21/n, TEM revealed different levels of compositional inhomogeneity at the subcrystal scale, which, in the case of BaLa2FeNiSbO9, leads to the occurrence of both a P21/n and an I2/m phase. Magnetometry and neutron diffraction show that these perovskites are ferrimagnets with a G-type magnetic structure. Their relatively low magnetisation can be attributed to their inhomogeneity. This work demonstrates the importance of studying the microstructure of complex compositions. |
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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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2020
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ISSN
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0022-4596
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DOI
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10.1016/J.JSSC.2020.121226
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Volume/pages
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285
(2020)
, p. 1-13
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Article Reference
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121226
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ISI
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000521107900017
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Medium
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E-only publicatie
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Full text (Publisher's DOI)
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Full text (open access)
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Full text (publisher's version - intranet only)
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