Structural chemistry and magnetic properties of the hexagonal double perovskite Ba2CoOsO6
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Date
2020-04-14
Journal Title
Journal ISSN
Volume Title
Publisher
American Chemical Society
Abstract
The double perovskite Ba2CoOsO6, synthesized using solid-state methods at ambient pressure, is shown as a rare example of an oxide adopting the 6L-trigonal (S.G.: P3̅m1) perovskite structure. The structure, refined using a combination of X-ray and neutron diffraction data, showed the Co and Os were ordered over the two dimer sites with additional ordering over the corner-sharing sites. Bond valence calculations show the presence of the Co(II) and Os(VI) valence states, and the latter was confirmed using X-ray absorption spectroscopy. Bulk magnetic susceptibility measurements show Ba2CoOsO6 to undergo antiferromagnetic ordering near 100 K, and neutron diffraction showed an ordered moment on the Co3, Co4, and Os2 sites; whereas the Os1/Co1 remained disordered. © 2020 American Chemical Society
Description
Keywords
Perovskites, Cations, Multigroup theory, X-ray diffraction, Neutron diffraction, Magnetic properties, Absorption spectroscopy, Antiferromagnetism
Citation
Kayser, P., Orlandi, F., Avdeev, M., Zhang, Z., Kimpton, J. A., & Kennedy, B. J. (2020). Structural chemistry and magnetic properties of the hexagonal double perovskite Ba2CoOsO6. Inorganic Chemistry, 59(9), 6613-6622. doi:10.1021/acs.inorgchem.0c00761