Structure evolution upon chemical and physical pressure in (Sr1−xBax)2FeSbO6
| Autor: | Taneli Tiittanen, Maarit Karppinen |
|---|---|
| Přispěvatelé: | Department of Chemistry and Materials Science, Aalto-yliopisto, Aalto University |
| Rok vydání: | 2017 |
| Předmět: |
Cation order
02 engineering and technology Crystal structure 010402 general chemistry 01 natural sciences Inorganic Chemistry Tetragonal crystal system Phase (matter) Materials Chemistry Physical and Theoretical Chemistry ta116 Physical pressure Chemistry Hexagonal crystal system Double perovskite 021001 nanoscience & nanotechnology Condensed Matter Physics Structural transformation 0104 chemical sciences Electronic Optical and Magnetic Materials Crystallography Ceramics and Composites High-pressure synthesis Chemical pressure 0210 nano-technology Monoclinic crystal system |
| Zdroj: | Journal of Solid State Chemistry. 246:245-251 |
| ISSN: | 0022-4596 |
| DOI: | 10.1016/j.jssc.2016.11.033 |
| Popis: | Here we demonstrate the gradual structural transformation from the monoclinic I 2/ m to tetragonal I 4/ m , cubic Fm -3 m and hexagonal P 6 3 / mmc structure upon the isovalent larger-for-smaller A-site cation substitution in the B-site ordered double-perovskite system (Sr 1−x Ba x ) 2 FeSbO 6 . This is the same transformation sequence previously observed up to Fm -3 m upon heating the parent Sr 2 FeSbO 6 phase to high temperatures. High-pressure treatment, on the other hand, transforms the hexagonal P 6 3 / mmc structure of the other end member Ba 2 FeSbO 6 back to the cubic Fm -3 m structure. Hence we may conclude that chemical pressure, physical pressure and decreasing temperature all work towards the same direction in the (Sr 1−x Ba x ) 2 FeSbO 6 system. Also shown is that with increasing Ba-for-Sr substitution level, i.e. with decreasing chemical pressure effect, the degree-of-order among the B-site cations, Fe and Sb, decreases. |
| Databáze: | OpenAIRE |
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