Phase diagram of the relaxor ferroelectric (1 - x)Pb(Mg1/3Nb2/3)O-3+xPbTiO(3) revisited: a neutron powder diffraction study of the relaxor skin effect

D. Phelan, E. E. Rodriguez, J. Gao, Y. Bing, Z-G Ye, Q. Huang, Jinsheng Wen, Guangyong Xu, C. Stock, M. Matsuura, P. M. Gehring*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

We revisit the phase diagram of the relaxor ferroelectric PMN-

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PT using neutron powder diffraction to test suggestions that residual oxygen vacancies and/or strain affect the ground state crystal structure. Powdered samples of PMN-

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PT were prepared with nominal compositions of

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, 0.20, 0.30, and 0.40 and divided into two identical sets, one of which was annealed in air to relieve grinding-induced strain and to promote an ideal oxygen stoichiometry. For a given composition and temperature the same structural phase is observed for each specimen. However, the distortions in all of the annealed samples are smaller than those in the as-prepared samples. Further, the diffraction patterns for

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, 0.20, and 0.30 are best refined using the monoclinic

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space group. By comparing our neutron diffraction results to those obtained on single crystals having similar compositions, we conclude that the relaxor skin effect in PMN-

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PT vanishes on the Ti-rich side of the morphotropic phase boundary.

Original languageEnglish
Pages (from-to)283-305
Number of pages23
JournalPhase transitions
Volume88
Issue number3
Early online date19 Jan 2015
DOIs
Publication statusPublished - 4 Mar 2015

Keywords

  • phase diagram
  • morphotropic phase boundary
  • skin effect
  • PMN
  • neutron diffraction
  • relaxors
  • X-RAY-DIFFRACTION
  • FIELD ISING-MODEL
  • LONG-RANGE ORDER
  • 2ND LENGTH SCALE
  • SINGLE-CRYSTALS
  • CUBIC PHASE
  • SCATTERING
  • TRANSITION
  • DEPENDENCE
  • STRAIN

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