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Title: Structural and magnetic properties of the osmium double perovskites Ba2–xSrxYOsO6
Authors: Kayser, P
Injac, S
Kennedy, BJ
Vogt, T
Avdeev, M
Maynard-Casely, HE
Zhang, Z
Keywords: Perovskites
Magnetic properties
Neutron diffraction
X-ray diffraction
Crystal structure
L-S coupling
Issue Date: 17-May-2017
Publisher: American Chemical Society
Citation: Kayser, P., Injac, S., Kennedy, B. J., Vogt, T., Avdeev, M., Maynard-Casely, H E., & Zhang, Z. (2017). Structural and magnetic properties of the osmium double perovskites Ba2–xSrxYOsO6. Inorganic Chemistry, 56(11), 6565–6575. doi:10.1021/acs.inorgchem.7b00691
Abstract: The crystal and magnetic structures of double perovskites of the type Ba2–xSrxYOsO6 were studied by synchrotron X-ray and neutron powder diffraction methods, bulk magnetic susceptibility measurements, and X-ray absorption spectroscopy. The structures were refined using combined neutron and synchrotron data sets based on an ordered array of corner-sharing YO6 and OsO6 octahedra, with the Ba/Sr cations being completely disordered. The structure evolves from cubic to monoclinic Fm3̅m (x ≈ 0.6) → I4/m (x ≈ 1.0) → I2/m (x ≈ 1.6) → P21/n as the Sr content is increased, due to the introduction of cooperative tilting of the octahedra. Bulk magnetic susceptibility measurements demonstrate the oxides are all anti-ferromagnets. The decrease in symmetry results in a nonlinear increase in the Neel temperature. Low-temperature neutron diffraction measurements of selected examples show these to be type-I anti-ferromagnets. X-ray absorption spectra collected at the Os L3- and L2-edges confirm the Os is pentavalent in all cases, and there is no detectable change in the covalency of the Os cation as the A-cation changes. Analysis of the L3/L2 branching ratio shows that the spin–orbit coupling is constant and insignificant across the series. © 2017 American Chemical Society
ISSN: 1520-510X
Appears in Collections:Journal Articles

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