Relaxor Behavior in Ordered Lead Magnesium Niobate (PbMg1/3Nb2/3O3) Thin Films

Smitha Shetty, Anoop Damodaran, Ke Wang, Yakun Yuan, Venkat Gopalan, Lane Martin, Susan Trolier-McKinstry

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4 Scopus citations

Abstract

The local compositional heterogeneity associated with the short-range ordering of Mg and Nb in PbMg1/3Nb2/3O3 (PMN) is correlated with its characteristic relaxor ferroelectric behavior. Fully ordered PMN is not prepared as a bulk material. This work examines the relaxor behavior in PMN thin films grown at temperatures below 1073 K by artificially reducing the degree of disorder via synthesis of heterostructures with alternate layers of Pb(Mg2/3Nb1/3)O3 and PbNbO3, as suggested by the random-site model. 100 nm thick, phase-pure films are grown epitaxially on (111) SrTiO3 substrates using alternate target timed pulsed-laser deposition of Pb(Mg2/3Nb1/3)O3 and PbNbO3 targets with 20% excess Pb. Selected area electron diffraction confirms the emergence of (1/2, 1/2, 1/2) superlattice spots with randomly distributed ordered domains as large as ≈150 nm. These heterostructures exhibit a dielectric constant of 800, loss tangents of ≈0.03 and 2× remanent polarization of ≈11 µC cm−2 at room temperature. Polarization–electric field hysteresis loops, Rayleigh data, and optical second-harmonic generation measurements are consistent with the development of ferroelectric domains below 140 K. Temperature-dependent permittivity measurements demonstrate reduced frequency dispersion compared to short range ordered PMN films. This work suggests a continuum between normal and relaxor ferroelectric behavior in the engineered PMN thin films.

Original languageEnglish (US)
Article number1804258
JournalAdvanced Functional Materials
Volume29
Issue number5
DOIs
StatePublished - Feb 1 2019
Externally publishedYes

Bibliographical note

Funding Information:
This work was funded by the Penn State MRSEC, Center for Nanoscale Science, under the award NSF DMR-1420620. The authors like to acknowledge the help of Beth Jones and Jeff Long in target preparation and electrical characterization setup. A.R.D. acknowledges support of the Army Research Office under Grant W911NF-14-1-0104. L.W.M. acknowledges support from the National Science Foundation under grant DMR-1708615.

Publisher Copyright:
© 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

Keywords

  • ferroelectricity
  • random site model
  • relaxor
  • short- and long-range order
  • temperature-dependent Rayleigh analysis

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