Abstract
Polycrystalline YMn 1− x Fe x O 3 ( x=0.02–0.20) powders were synthesized by means of modified citrate method. Powder X-ray diffraction gives evidence that all the samples are single phase and exhibit hexagonal structure with P6 3 cm space group as observed for YMnO 3. The solubility limit of Fe was determined as about 6 wt.%. Cell parameter values were found to increase with Fe content, since Fe 3+ and Mn 3+ have the same ionic radii. This can be attributed to the increase of the tilting of MnO 5 bipyramid and the buckling of Y atoms. In addition, 57Fe Mössbauer spectrometry provides evidence of two Fe 3+ sites attributed to two different nearest atomic neighbours. Magnetic properties reveal a paramagnetic-to-antiferromagnetic transition, a possible increase of the magnetic anisotropy, and a competition between ferromagnetic and antiferromagnetic interactions.
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