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Structural, magnetic and electrical properties of the hexagonal ferrites MFeO3 (M=Y, Yb, In)

DOI: 10.1016/j.jssc.2012.02.004 DOI Help

Authors: Lewis Downie (University of St Andrews) , Richard Goff (University of St Andrews) , Winfred Kockelmann (ISIS Pulsed Neutron and Muon Source) , Sue D. Forder (Sheffield Hallam University, U.K.) , Julia Parker (Diamond Light Source) , Finlay Morrison (University of St Andrews) , P Lightfoot (University of St Andrews)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Solid State Chemistry , VOL 190 , PAGES 52-60

State: Published (Approved)
Published: June 2012

Abstract: The hexagonal ferrites MFeO3 (M=Y, Yb, In) have been studied using a combination of neutron and X-ray powder diffraction, magnetic susceptibility, dielectric measurements and Fe-57 Mossbauer spectroscopy. This study confirms the previously reported crystal structure of InFeO3 (YAlO3 structure type, space group P6(3)/mmc), but YFeO3 and VbFeO(3) both show a lowering of symmetry to at most P6(3)cm (ferrielectric YMnO3 structure type). However, Mossbauer spectroscopy shows at least two distinct Fe sites for both YFeO3 and YbFeO3 and we suggest that the best model to rationalise this involves phase separation into more than one similar hexagonal YMnO3-like phase. Rietveld analysis of the neutron diffraction data was carried out using two hexagonal phases as a simplest case scenario. In both YFeO3 and YbFeO3, 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 YFeO3 and YbFeO3, 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 YFeO3 and YbFeO3 at low temperatures. Due to poor sample crystallinity, the compositional and structural effects underlying the phase separation and possible magnetoelectric phenomena cannot be ascertained. (C) 2012 Elsevier Inc. All rights reserved.

Journal Keywords: Crystallography; Dielectric Materials; Electrical Properties; Ferrite; Ferrites; Hcp Lattices; Iron 57; Lattice Parameters; Magnetic Susceptibility; Moessbauer Effect; Neutron Diffraction; Neutrons; Space Groups; Symmetry; X-Ray Diffraction

Subject Areas: Chemistry


Instruments: I11-High Resolution Powder Diffraction

Added On: 08/10/2012 14:25

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