Single crystal X-ray and synchrotron X-ray powder diffraction have been used to probe the structure of Ba3NaIr2O9 from 300 K down to 20 K. Ba3NaIr2O9 is found to undergo a structural transition from hexagonal symmetry, P63/mmc, at ambient temperature to monoclinic symmetry, C2/c, at low temperature. The evolution of the unit cell volume upon cooling is indicative of a higher order structural transition, and the symmetry breaking becomes apparent as the temperature is decreased. The low temperature monoclinic structure of Ba3NaIr2O9 contains strongly distorted [NaO6] and [IrO6] octahedra in comparison to the room temperature hexagonal structure.
|Number of pages||6|
|Journal||Solid State Sciences|
|Publication status||Published - 2009 Mar|
Bibliographical noteFunding Information:
This work was supported by the Department of Energy through grant DE-FG02-04ER46122 and the National Science Foundation through grant DMR: 0450103 and DMR: 0804209. Y. Lee thanks support by the Korea Research Foundation Grant funded by the Korean Government (MOEHRD) (KRF-2006-D00538).
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics