| dc.description |
The Fe<sub>1+x</sub>Ti<sub>2-x</sub>O<sub>5</sub>, 0 x1, solid solution series has been systematically investigated by means of x-ray diffraction, Mössbauer spectroscopy and neutron diffraction. The results confirm that the Fe<sub>1+x</sub>Ti<sub>2-x</sub>O<sub>5</sub>, 0 x1 pseudobrookite series has an orthorhombic structure with the D<sub>2h</sub><sup>17</sup> (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 (Fe<sup>2+</sup>, Fe<sup>3+</sup> and Ti<sup>4+</sup>) 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 x1. The agreement between the Mössbauer and neutron site occupancies indicates that the Fe<sup>3+</sup> and Fe<sup>2+</sup> site preferences are the same. |
