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Crystal and Magnetic Structures of High Pressure Perovskite-Type Oxyfluorides,PbFeO2F and 0.5PbFeO2F-0.5PbTiO3 [Pb(Fe0.5Ti0.5)O2.5F0.5]

Published online by Cambridge University Press:  26 February 2011

Tetsuhiro Katsumata ,
Akihiro Takase ,
Masashi Yoshida ,
Yoshiyuki Inaguma ,
John E. Greedan ,
Jacques Barbier ,
Lachlan M. D. Cranswick  and
Mario Bieringer
Tetsuhiro Katsumata
Affiliation:
20001996@gakushuin.ac.jp, Gakushuin Univ., Chemistry, 1-5-1 Mejiro, Toshima-ku, Tokyo, 171-8588, Japan
Akihiro Takase
Affiliation:
20001996@gakushuin.ac.jp, Gakushuin Univ., Faculty of Science, 1-5-1 Mejiro, Toshima-ku, Tokyo, 171-8588, Japan
Masashi Yoshida
Affiliation:
20001996@gakushuin.ac.jp, Gakushuin Univ., Faculty of Science, 1-5-1 Mejiro, Toshima-ku, Tokyo, 171-8588, Japan
Yoshiyuki Inaguma
Affiliation:
yoshiyuki.inaguma@gakushuin.ac.jp, Gakushuin Univ., Faculty of Science, 1-5-1 Mejiro, Toshima-ku, Tokyo, 171-8588, Japan
John E. Greedan
Affiliation:
greedan@univmail.cis.mcmaster.ca, McMaster Univ., Chemistry department and Brockhouse Institute for Materials Research, 1280 Main Street West, Hamilton, L8S 4M1, Canada
Jacques Barbier
Affiliation:
barbier@mcmaster.ca, McMaster Univ., Chemistry department and Brockhouse Institute for Materials Research, 1280 Main Street West, Hamilton, L8S 4M1, Canada
Lachlan M. D. Cranswick
Affiliation:
lachlan.cranswick@nrc.gc.ca, Canadian Neutron Bean Center, Building 459, Chalk River Laboratories, Chalk River, K0J 1J0, Canada
Mario Bieringer
Affiliation:
mario_bieringer@umanitoba.ca, University of Manitoba, Department of Chemistry, 506 Parker Building, Winnipeg, R3T 2N2, Canada
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Abstract

The perovskites PbFeO2F and 0.5PbFeO2F-0.5PbTiO3 were synthesized at high temperatures (1000°C) and high pressures (4 – 6 GPa). The crystal and magnetic structures were determined using powder neutron diffraction. Quenched PbFeO2F has the cubic perovskite-type, Pm3m, structure in which the Pb ion shifts from ideal A-site along the <110> directions, which is in good accordance with a previous report. The magnetic structure is antiferromagnetic G-type with propagation vector k = (1/2 1/2 1/2) and an Fe3+ ordered moment of 3.83 μB at 283K. The Néel temperature is 655(5) K. Annealed PbFeO2F has a tetragonal perovskite-type structure at room temperature and transforms reversibly from tetragonal to cubic at approximately 470 K. A superlattice with dimensions a × a × 5c is observed both in electron and x-ray diffraction. The solid solution 0.5PbFeO2F-0.5PbTiO3 belongs to the non-centrosymmetric space group P4mm. The magnetic structure is G-type antiferromagnetic and shows a weak ferromagnetic moment at 4 K. Consequently, 0.5PbFeO2F-0.5PbTiO3 is simultaneously ferroelectric and a weak ferromagnet at low temperature. The Néel temperature is 450 K but the temperature dependence of the ordered Fe moment is anomalous.

Keywords

ferroelectricferromagneticx-ray diffraction (XRD)
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 988: Symposium QQ – Solid-State Chemistry of Inorganic Materials VI , 2006 , 0988-QQ06-03
Copyright
Copyright © Materials Research Society 2007

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