Reaction of the = 1 Ruddlesden-Popper oxide LaSrCoRuO with CaH yields the oxyhydride phase LaSrCoRuOH via a topochemical anion exchange. Close inspection of the X-ray and neutron powder diffraction data in combination with HAADF-STEM images reveals that the nanoparticles of SrO are exsolved from the system during the reaction, with the change in cation stoichiometry accommodated by the inclusion of > 1 (Co/Ru)OH "perovskite" layers into the Ruddlesden-Popper stacking sequence. This novel pseudotopochemical process offers a new route for the formation of > 1 Ruddlesden-Popper structured materials. Magnetization data are consistent with a LaSrCoRuOH (Co, d, = 1; Ru, d, = 0) oxidation/spin state combination. Neutron diffraction and μSR data show no evidence for long-range magnetic order down to 2 K, suggesting the diamagnetic Ru centers impede the Co-Co magnetic-exchange interactions.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1021/acs.inorgchem.9b02552 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Exsolution of SrO during the Topochemical Conversion of LaSrCoRuO to the Oxyhydride LaSrCoRuOH.
Inorg Chem
November 2019
Department of Chemistry , University of Oxford, Inorganic Chemistry Laboratory, South Parks Road , Oxford OX1 3QR , U.K.
Reaction of the = 1 Ruddlesden-Popper oxide LaSrCoRuO with CaH yields the oxyhydride phase LaSrCoRuOH via a topochemical anion exchange. Close inspection of the X-ray and neutron powder diffraction data in combination with HAADF-STEM images reveals that the nanoparticles of SrO are exsolved from the system during the reaction, with the change in cation stoichiometry accommodated by the inclusion of > 1 (Co/Ru)OH "perovskite" layers into the Ruddlesden-Popper stacking sequence. This novel pseudotopochemical process offers a new route for the formation of > 1 Ruddlesden-Popper structured materials.
View Article and Find Full Text PDFExsolution of Fe and SrO Nanorods and Nanoparticles from Lanthanum Strontium Ferrite LaSrFeO Materials by Hydrogen Reduction.
J Phys Chem C Nanomater Interfaces
September 2015
Institute of Physical Chemistry, University of Innsbruck, Innrain 80-82, A-6020 Innsbruck, Austria.
Formation of uniform Fe and SrO rods as well as nanoparticles following controlled reduction of LaSrFeO (LSF) and Ni-LSF samples in dry and moist hydrogen is studied by aberration-corrected electron microscopy. Metallic Fe and SrO precipitate from the perovskite lattice as rods of several tenths of nm and thicknesses up to 20 nm. Based on a model of Fe whisker growth following reduction of pure iron oxides, Fe rod exsolution from LSF proceeds via rate-limiting lattice oxygen removal.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!