Title
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Comparative study of the magnetic properties of for B' = Nb, Ta or Sb
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Author
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Abstract
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Polycrystalline samples of La3Ni2NbO9 and La3Ni2TaO9 have been characterised by X-ray and neutron diffraction, electron microscopy, magnetometry and muon spin relaxation (mu SR); the latter technique was also applied to La3Ni2SbO9. On the length scale of a neutron diffraction experiment, the six-coordinate sites of the monoclinic perovskite structure are occupied in a 1:1 ordered manner by Ni and a random 1/3Ni/2/3B' mixture. Electron microscopy demonstrated that this 1:1 ordering is maintained over microscopic distances, although diffuse scattering indicative of short-range ordering on the mixed site was observed. No magnetic Bragg scattering was observed in neutron diffraction patterns collected from La3Ni2B'O-9 (B' = Nb or Ta) at 5 K although in each case mu SR identified the presence of static spins below 30 K. Magnetometry showed that La3Ni2NbO9 behaves as a spin glass below 29 K but significant short-range interactions are present in La3Ni2NbO9 below 85 K. The contrasting properties of these compounds are discussed in terms of their microstructure. |
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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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2018
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ISSN
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0022-4596
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DOI
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10.1016/J.JSSC.2017.12.018
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Volume/pages
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258
(2018)
, p. 825-834
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ISI
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000423650400107
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Full text (Publisher's DOI)
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Full text (publisher's version - intranet only)
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