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Title: Structural, magnetic and electrical properties of the hexagonal ferrites MFeO{sub 3} (M=Y, Yb, In)

Abstract

The hexagonal ferrites MFeO{sub 3} (M=Y, Yb, In) have been studied using a combination of neutron and X-ray powder diffraction, magnetic susceptibility, dielectric measurements and {sup 57}Fe Moessbauer spectroscopy. This study confirms the previously reported crystal structure of InFeO{sub 3} (YAlO{sub 3} structure type, space group P6{sub 3}/mmc), but YFeO{sub 3} and YbFeO{sub 3} both show a lowering of symmetry to at most P6{sub 3}cm (ferrielectric YMnO{sub 3} structure type). However, Moessbauer spectroscopy shows at least two distinct Fe sites for both YFeO{sub 3} and YbFeO{sub 3} and we suggest that the best model to rationalise this involves phase separation into more than one similar hexagonal YMnO{sub 3}-like phase. Rietveld analysis of the neutron diffraction data was carried out using two hexagonal phases as a simplest case scenario. In both YFeO{sub 3} and YbFeO{sub 3}, 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} and YbFeO{sub 3}, 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} and YbFeO{sub 3} at low temperatures. Due to poormore » sample crystallinity, the compositional and structural effects underlying the phase separation and possible magnetoelectric phenomena cannot be ascertained. - Graphical abstract: Hexagonal MFeO{sub 3} (M=Y, Yb) exhibit phase separation into two YMnO{sub 3}-like phases. Variable temperature crystallographic, electrical and magnetic studies suggest weak correlations between electrical and magnetic responses and long-range magnetic order at low temperature. Highlights: Black-Right-Pointing-Pointer Multi-technique study of multiferroic hexagonal MFeO{sub 3}. Black-Right-Pointing-Pointer Phase separation into two similar hexagonal phases. Black-Right-Pointing-Pointer Weak coupling of electrical and magnetic responses. Black-Right-Pointing-Pointer Long-range magnetic order at low T.« less

Authors:
;  [1];  [2];  [3];  [4];  [1];  [1]
  1. EaStCHEM and School of Chemistry, University of St Andrews, St Andrews, Fife, KY16 9ST (United Kingdom)
  2. STFC ISIS Facility, Rutherford Appleton Laboratory, Chilton, Oxon, OX11 0QX (United Kingdom)
  3. Materials and Engineering Research Institute, Sheffield Hallam University, City Campus, Sheffield, S1 1WB (United Kingdom)
  4. Diamond Light Source, Ltd., Harwell Science and Innovation Campus, Didcot, Oxfordshire, OX11 ODE (United Kingdom)
Publication Date:
OSTI Identifier:
22012124
Resource Type:
Journal Article
Journal Name:
Journal of Solid State Chemistry
Additional Journal Information:
Journal Volume: . 190; Other Information: Copyright (c) 2012 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0022-4596
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; CRYSTALLOGRAPHY; DIELECTRIC MATERIALS; ELECTRICAL PROPERTIES; FERRITE; FERRITES; HCP LATTICES; IRON 57; LATTICE PARAMETERS; MAGNETIC SUSCEPTIBILITY; MOESSBAUER EFFECT; NEUTRON DIFFRACTION; NEUTRONS; SPACE GROUPS; SYMMETRY; TEMPERATURE RANGE 0065-0273 K; X-RAY DIFFRACTION

Citation Formats

Downie, Lewis J., Goff, Richard J., Kockelmann, Winfried, Forder, Sue D., Parker, Julia E., Morrison, Finlay D., and Lightfoot, Philip, E-mail: pl@st-and.ac.uk. Structural, magnetic and electrical properties of the hexagonal ferrites MFeO{sub 3} (M=Y, Yb, In). United States: N. p., 2012. Web. doi:10.1016/J.JSSC.2012.02.004.
Downie, Lewis J., Goff, Richard J., Kockelmann, Winfried, Forder, Sue D., Parker, Julia E., Morrison, Finlay D., & Lightfoot, Philip, E-mail: pl@st-and.ac.uk. Structural, magnetic and electrical properties of the hexagonal ferrites MFeO{sub 3} (M=Y, Yb, In). United States. doi:10.1016/J.JSSC.2012.02.004.
Downie, Lewis J., Goff, Richard J., Kockelmann, Winfried, Forder, Sue D., Parker, Julia E., Morrison, Finlay D., and Lightfoot, Philip, E-mail: pl@st-and.ac.uk. Fri . "Structural, magnetic and electrical properties of the hexagonal ferrites MFeO{sub 3} (M=Y, Yb, In)". United States. doi:10.1016/J.JSSC.2012.02.004.
@article{osti_22012124,
title = {Structural, magnetic and electrical properties of the hexagonal ferrites MFeO{sub 3} (M=Y, Yb, In)},
author = {Downie, Lewis J. and Goff, Richard J. and Kockelmann, Winfried and Forder, Sue D. and Parker, Julia E. and Morrison, Finlay D. and Lightfoot, Philip, E-mail: pl@st-and.ac.uk},
abstractNote = {The hexagonal ferrites MFeO{sub 3} (M=Y, Yb, In) have been studied using a combination of neutron and X-ray powder diffraction, magnetic susceptibility, dielectric measurements and {sup 57}Fe Moessbauer spectroscopy. This study confirms the previously reported crystal structure of InFeO{sub 3} (YAlO{sub 3} structure type, space group P6{sub 3}/mmc), but YFeO{sub 3} and YbFeO{sub 3} both show a lowering of symmetry to at most P6{sub 3}cm (ferrielectric YMnO{sub 3} structure type). However, Moessbauer spectroscopy shows at least two distinct Fe sites for both YFeO{sub 3} and YbFeO{sub 3} and we suggest that the best model to rationalise this involves phase separation into more than one similar hexagonal YMnO{sub 3}-like phase. Rietveld analysis of the neutron diffraction data was carried out using two hexagonal phases as a simplest case scenario. In both YFeO{sub 3} and YbFeO{sub 3}, 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} and YbFeO{sub 3}, 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} and YbFeO{sub 3} at low temperatures. Due to poor sample crystallinity, the compositional and structural effects underlying the phase separation and possible magnetoelectric phenomena cannot be ascertained. - Graphical abstract: Hexagonal MFeO{sub 3} (M=Y, Yb) exhibit phase separation into two YMnO{sub 3}-like phases. Variable temperature crystallographic, electrical and magnetic studies suggest weak correlations between electrical and magnetic responses and long-range magnetic order at low temperature. Highlights: Black-Right-Pointing-Pointer Multi-technique study of multiferroic hexagonal MFeO{sub 3}. Black-Right-Pointing-Pointer Phase separation into two similar hexagonal phases. Black-Right-Pointing-Pointer Weak coupling of electrical and magnetic responses. Black-Right-Pointing-Pointer Long-range magnetic order at low T.},
doi = {10.1016/J.JSSC.2012.02.004},
journal = {Journal of Solid State Chemistry},
issn = {0022-4596},
number = ,
volume = . 190,
place = {United States},
year = {2012},
month = {6}
}