Mössbauer spectroscopic study of iron-doped zirconia synthesized by microwave route
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Abstract
Zirconium oxide (zirconia) exists in three crystalline forms of monoclinic, tetragonal and cubic structures at atmospheric pressures. The cubic form of zirconia is well known for its mechanical, electrochemical and optical applications. Fe-doped cubic zirconia (high temperature phase) compositions are synthesized by microwave combustion method. Here, we present a Mössbauer investigation of Zr1 − x Fe x O2 composition within a range of Fe (0.03 < x < 0.09). 57Fe Mössbauer spectra were recorded at room temperature and at low temperature (77 K) for all samples. 3% Fe-doped ZrO2 shows doublet and the corresponding 6% and 9% Fe-doped ZrO2 samples show superimposed sextet and doublets. The isomer shift and quadrupole moment indicate, Iron to be in III oxidation state and to occupy different octahedral sites, associated with some amount of disorder. X-ray powder diffraction pattern of Fe-doped ZrO2 samples appear as very well crystalline. The Miller indices refer to the cubic fluorite-type ZrO2 structure. The magnetic behavior shows increase in moment and decrease in coercivity, with increase in Fe concentration. The M vs. H plots of the as-prepared Zr1-x Fe x O2 essentially show typical hysteresis loops, indicating room temperature ferromagnetism. Thus, the introduced microwave combustion route is an effective process to achieve multifunctional Fe-doped Zirconia with coexistent magnetic properties.
Keywords
Zirconia Mössbauer spectroscopy FerromagnetismPreview
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