Structural distortions and self-activated photoluminescence in reductively annealed

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Date
2019-08-01
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Elsevier
Abstract
A tetragonal oxyfluoride Ba2SrGaO4F, a novel material in the Sr3AlO4F family of materials, has been synthesized via solid-state method and exhibits self-activated photoluminescence (PL) under 254 nm light after annealing in a reducing atmosphere of 4%H2/96% Ar. The structure of this material is determined by powder x-ray diffraction and confirmed using high-resolution neutron powder diffraction, which reveals similarities to Sr3AlO4F-type oxyfluorides and Ba2GaLaO5. Analysis of the refined Ba2SrGaO4F structure at room temperature reveals subtle changes in the polyhedral sub-units between the reductively annealed and air-annealed samples, which are correlated with the PL emission. © 2019 Elsevier Inc.
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Keywords
Neutron diffraction, Oxyfluorides, Rare earths, Photoluminescence, Neutron diffraction, X-ray diffraction
Citation
Green, R. L., Avdeev, M., Pierre, V. (2019). Structural distortions and self-activated photoluminescence in reductively annealed Ba2SrGaO4F. Journal of Solid State Chemistry, 276, 376-381, doi:10.1016/j.jssc.2019.05.024
URI
https://doi.org/10.1016/j.jssc.2019.05.024
 https://apo.ansto.gov.au/dspace/handle/10238/11087
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