Small-moment paramagnetism and extensive twinning in the topochemically reduced phase Sr2ReLiO5.5

Nijat Hasanli, Nicolas Gauquelin, Johan Verbeeck, Joke Hadermann, Michael A. Hayward*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

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-Sr2O2-ReLiO4-Sr2O2-ReLiO4-stacking sequence of the parent phase into a-Sr2O2-ReLiO3-Sr2O2-ReLiO4-, 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.

Original languageEnglish
Pages (from-to)15783-15790
Number of pages8
JournalDalton transactions
Volume47
Issue number44
DOIs
Publication statusPublished - 2018

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