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Title
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Small-moment paramagnetism and extensive twinning in the topochemically reduced phase
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Author
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Abstract
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| Reaction of the cation-ordered double perovskite Sr2ReLiO6 with dilute hydrogen at 475 °C leads to the topochemical deintercalation of oxide ions from the host lattice and the formation of a phase of composition Sr2ReLiO5.5, as confirmed by thermogravimetric and EELS data. A combination of neutron and electron diffraction data reveals the reduction process converts the Sr2O2ReLiO4Sr2O2ReLiO4 stacking sequence of the parent phase into a Sr2O2ReLiO3Sr2O2ReLiO4, partially anion-vacant ordered sequence. Furthermore a combination of electron diffraction and imaging reveals Sr2ReLiO5.5 exhibits extensive twinning a feature which can be attributed to the large, anisotropic volume expansion of the material on reduction. Magnetisation data reveal a strongly reduced moment of μeff = 0.505μB for the d1 Re6+ centres in the phase, suggesting there remains a large orbital component to the magnetism of the rhenium centres, despite their location in low symmetry coordination environments. |
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Language
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English
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Source (journal)
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Dalton Transactions : an international journal of inorganic chemistry / Royal Society of Chemistry [London] - Cambridge, 2003, currens
Journal of the Chemical Society : Dalton transactions. - London, 1972 - 1999
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Publication
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Cambridge
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Royal Society of Chemistry
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2018
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ISSN
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1477-9226
[print]
1477-9234
[online]
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DOI
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10.1039/C8DT03463J
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Volume/pages
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47
:44
(2018)
, p. 15783-15790
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ISI
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000450208000019
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Pubmed ID
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30357235
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Full text (Publisher's DOI)
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Full text (open access)
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