Mossbauer Study of Ti0.9957Fe0.01O

The rutile polycrystal Ti_(0.99)(57)^Fe_(0.01)O₂ prepared with (57)^Fe enriched iron have been studied by Mossbauer spectroscopy, X-ray diffraction and VSM. The Mossbauer spectrum of Ti_(0.99)(57)^Fe_(0.01)O₂ consists of a ferromagnetic and a paramagnetic phase over all temperature ranging from 4 to 300 K. Isomer shifts indicate Fe²+ for the ferromagnetic phase, but Fe³+ for the paramagneic phase of Ti_(0.99)(57)^Fe_(0.01)O₂ sample. It is noted that the magnetic hyperfine field of ferromagnetic phase had the value about 1.48 times as large as that of α-Fe. The XRD data for Ti_(0.99)(57)^Fe_(0.01)O₂ showed a pure rutile phase with tetragonal structures without any segregation of Fe into particulates within the instrumental resolution limit. The magnetic hysteresis (M-H) curve at room temperature showed an obvious ferromagnetic behavior and the magnetic moment per Fe atom under the applied field of 1T was estimated to be about 0.71 μ_B, suggesting a low spin configuration of Fe ions.