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Tetrastrontium dimanganese copper nonaoxide, Sr4Mn2CuO9
Ahmed El Abed1, Etienne Gaudin, Jacques Darriet
1ICMCB, UPR9048 CNRS, Université Bordeaux 1, 87 Avenue du Docteur Schweitzer, 33608 Pessac Cedex, France.
Summary
Single crystals of strontium manganese copper oxide were synthesized and their structure solved. A novel chain structure with face-sharing polyhedra and a stacking fault was identified.
Area of Science:
- Solid-state chemistry
- Crystallography
- Materials science
Background:
- Hexagonal perovskites represent a significant class of materials with diverse properties.
- Understanding the structural intricacies of complex oxides is crucial for materials design.
Purpose of the Study:
- To synthesize single crystals of Sr(4)Mn(2.09)Cu(0.91)O(9).
- To determine the crystal structure of this novel compound.
- To elucidate the arrangement of manganese and copper atoms within the structure.
Main Methods:
- Flux synthesis for crystal growth.
- Single-crystal X-ray diffraction for structural analysis.
- Space group determination (P321).
Main Results:
- The crystal structure of Sr(4)Mn(2)CuO(9) was solved, closely related to the hexagonal perovskite 2H structure.
- The structure features chains of face-sharing polyhedra: two octahedra followed by one trigonal prism.
- Manganese atoms occupy the octahedra, while copper atoms are randomly distributed in the trigonal prisms. A stacking fault was observed.
Conclusions:
- The flux synthesis method is effective for growing Sr(4)Mn(2.09)Cu(0.91)O(9) single crystals.
- The determined crystal structure reveals a unique arrangement of Mn and Cu atoms within polyhedral chains.
- The observed stacking fault provides insights into potential structural instabilities or growth mechanisms.