Structural distortions and self-activated photoluminescence in reductively annealed Ba2SrGaO4F
| Autor: | Maxim Avdeev, Valinteshley Pierre, Robert L. Green |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Diffraction
Neutron powder diffraction Photoluminescence Materials science Annealing (metallurgy) Reducing atmosphere 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Electronic Optical and Magnetic Materials Inorganic Chemistry Tetragonal crystal system Crystallography Materials Chemistry Ceramics and Composites Physical and Theoretical Chemistry 0210 nano-technology |
| Zdroj: | Journal of Solid State Chemistry. 276:376-381 |
| ISSN: | 0022-4596 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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