Publication
Title
Small-moment paramagnetism and extensive twinning in the topochemically reduced phase $Sr_{2}ReLiO_{5.5}$
Author
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 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.
Language
English
Source (journal)
Journal of the Chemical Society: Dalton transactions. - London
Journal of the Chemical Society: Dalton transactions. - London
Publication
London : 2018
ISSN
0300-9246
1477-9226
1472-7773
Volume/pages
47 :44 (2018) , p. 15783-15790
ISI
000450208000019
Pubmed ID
30357235
Full text (Publisher's DOI)
Full text (open access)
UAntwerpen
 Faculty/Department Research group Project info SOLARPAINT: Understanding the durability of light sensitive materials: transferring insights between solar cell physics and the chemistry of paintings. Publication type Subject Affiliation Publications with a UAntwerp address