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Downie, Lewis J.
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article
Structural, magnetic and electrical properties of the hexagonal ferrites MFeO3 (M=Y, Yb, In)
Abstract
The hexagonal ferrites MFeO<sub>3</sub> (M=Y, Yb, In) have been studied using a combination of neutron and X-ray powder diffraction, magnetic susceptibility, dielectric measurements and <sup>57</sup>Fe Mössbauer spectroscopy. This study confirms the previously reported crystal structure of InFeO<sub>3</sub> (YAlO<sub>3</sub> structure type, space group <em>P</em>6<sub>3</sub>/<em>mmc</em>), but YFeO<sub>3</sub> and YbFeO<sub>3</sub> both show a lowering of symmetry to at most <em>P</em>6<sub>3</sub><em>cm</em> (ferrielectric YMnO<sub>3</sub> structure type). However, Mössbauer spectroscopy shows at least two distinct Fe sites for both YFeO<sub>3</sub> and YbFeO<sub>3</sub> and we suggest that the best model to rationalise this involves phase separation into more than one similar hexagonal YMnO<sub>3</sub>-likephase. Rietveld analysis of the neutron diffraction data was carriedout using two hexagonal phases as a simplest case scenario. In both YFeO<sub>3</sub> and YbFeO<sub>3</sub>, distinct dielectric anomalies are observed near 130 K and 150 K, respectively. These are tentatively correlated with weak anomalies in magnetic susceptibility and lattice parameters, for YFeO<sub>3</sub> and YbFeO<sub>3</sub>, respectively, which may suggest a weak magnetoelectric effect. Comparison of neutron and X-ray powder diffraction shows evidence of long-range magnetic order in both YFeO<sub>3</sub> and YbFeO<sub>3</sub> at low temperatures. Due to poor sample crystallinity,the compositional and structural effects underlying the phaseseparation and possible magnetoelectric phenomena cannot be ascertained.