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Domain variance and superstructure across the antiferroelectric/ferroelectric phase boundary in Pb1−1.5xLax(Zr0.9TiM0.1)O3

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Knudsen, Jesper, Woodward, David I. and Reaney, I. M.. (2003) Domain variance and superstructure across the antiferroelectric/ferroelectric phase boundary in Pb1−1.5xLax(Zr0.9TiM0.1)O3. Journal of Materials Research, Vol.18 (No.2). pp. 262-271. ISSN 0884-2914

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Abstract

Transmission electron microscopy, x-ray diffraction, relative permittivity as a
function of temperature, and polarization versus field loops were used to study the
antiferroelectric/ferroelectric (AFE/FE) phase boundary in Pb1−1.5xLaxZr0.9Ti0.1O3
(PLZT, 100x/90/10) ceramics. X-ray diffraction and electrical measurements indicated
a FE rhombohedral (R) to AFE tetragonal (T) phase transition between PLZT 2/90/10
and 4/90/10. Both phases exhibited superstructure reflections in electron-diffraction
patterns at 1⁄2{hkl} positions consistent with rotations of the octahedra in antiphase.
Previously, neutron diffraction suggested that the FER has an a−a−a− tilt system
(Glazer notation), in agreement with its macroscopic symmetry. By analogy, it is
proposed that the AFET phase has an a0a0c− tilt system. The AFE phase was also
characterized by incommensurate superstructure along pseudocubic 〈110〉p directions,
whereas the FE phase had extra commensurate superlattice reflections at 1⁄2{hk0}p
positions. 1⁄2{hk0}p reflections are forbidden in both tilt systems, but their presence is
explained by Pb ion displacements averaged along 〈111〉 but with short coherence
antiparallel components along 〈110〉 directions. The antiparallel Pb displacements are
coupled to an a−b−b− (a ≈ b) monoclinic tilt system in the vicinity of the AFE/FE
boundary.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Divisions: Faculty of Science > Physics
Library of Congress Subject Headings (LCSH): Ceramics -- Electric properties, Ceramics -- Analysis, Ferroelectricity
Journal or Publication Title: Journal of Materials Research
Publisher: Cambridge University Press
ISSN: 0884-2914
Official Date: 2003
Dates:
DateEvent
2003Published
Volume: Vol.18
Number: No.2
Page Range: pp. 262-271
Identification Number: 10.1557/JMR.2003.0037
Status: Peer Reviewed
Access rights to Published version: Restricted or Subscription Access
Funder: Great Britain. Ministry of Defence (MoD)
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URI: http://wrap.warwick.ac.uk/id/eprint/4531

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