Crystal structure and cation distributions in the FeTi2O5- Fe2TiO5 solid solution series
Abstract
The Fe1+xTi2-xO5, 0icons/Journals/Common/le" ALT="le" ALIGN="TOP"/> xicons/Journals/Common/le" ALT="le" ALIGN="TOP"/>1, solid solution series has been systematically investigated by means of x-ray diffraction, Mössbauer spectroscopy and neutron diffraction. The results confirm that the Fe1+xTi2-xO5, 0icons/Journals/Common/le" ALT="le" ALIGN="TOP"/> xicons/Journals/Common/le" ALT="le" ALIGN="TOP"/>1 pseudobrookite series has an orthorhombic structure with the D2h17 (Cmcm) space group. The unit cell contains four formula units. The site occupancies obtained from both Mössbauer spectra and neutron diffraction data indicate that the cation (Fe2+, Fe3+ and Ti4+) distributions in the available sites, 4c and 8f, are neither random nor perfectly ordered. At x = 0, most of the iron is in the 4c site, and the 8f site fills progressively as xicons/Journals/Common/to" ALT="to" ALIGN="TOP"/>1. The agreement between the Mössbauer and neutron site occupancies indicates that the Fe3+ and Fe2+ site preferences are the same.
- Publication:
-
Journal of Physics Condensed Matter
- Pub Date:
- August 1999
- DOI:
- 10.1088/0953-8984/11/33/304
- Bibcode:
- 1999JPCM...11.6337G