Role of random electric fields in relaxors

Daniel Phelan, Christopher Stock, Jose A. Rodriguez-Rivera, Songxue Chi, Juscelino Leao, Xifa Long, Yujuan Xie, Alexei A. Bokov, Zuo-Guang Ye, Panchapakesan Ganesh, Peter M. Gehring*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

PbZr1–xTixO3 (PZT) and Pb(Mg1/3Nb2/3)1–xTixO3 (PMN-xPT) are complex lead-oxide perovskites that display exceptional piezoelectric properties for pseudorhombohedral compositions near a tetragonal phase boundary. In PZT these compositions are ferroelectrics, but in PMN-xPT they are relaxors because the dielectric permittivity is frequency dependent and exhibits non-Arrhenius behavior. We show that the nanoscale structure unique to PMN-xPT and other lead-oxide perovskite relaxors is absent in PZT and correlates with a greater than 100% enhancement of the longitudinal piezoelectric coefficient in PMN-xPT relative to that in PZT. By comparing dielectric, structural, lattice dynamical, and piezoelectric measurements on PZT and PMN-xPT, two nearly identical compounds that represent weak and strong random electric field limits, we show that quenched (static) random fields establish the relaxor phase and identify the order parameter.

Original languageEnglish
Pages (from-to)1754-1759
Number of pages6
JournalProceedings of the National Academy of Sciences
Volume111
Issue number5
DOIs
Publication statusPublished - 4 Feb 2014

Keywords

  • lead zirconate titanate
  • piezoelectricity
  • short-range order
  • soft modes
  • neutron scattering
  • DIFFUSE-SCATTERING
  • SINGLE-CRYSTAL
  • ELECTROMECHANICAL RESPONSE
  • FERROELECTRICS
  • PBMG1/3TA2/3O3
  • PEROVSKITES
  • INSTABILITY

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