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Phase diagram of the relaxor ferroelectric (1-x )Pb(Mg1/3Nb2/3)O 3+x PbTiO3 revisited: a neutron powder diffraction study of the relaxor skin effect

Journal Article · · Phase Transitions
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We revisit the phase diagram of the relaxor ferroelectric PMN-xPT using neutron powder diffraction to test suggestions that residual oxygen vacancies and/or strain affect the ground state crystal structure. Powdered samples of PMN-xPT were prepared with nominal compositions of x = 0:10, 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-grown samples. Further, the diffraction patterns for x = 0:10, 0.20, and 0.30 are best refined using the monoclinic Cm 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-xPT vanishes on the Ti-rich side of the morphotropic phase boundary.

Research Organization:
Argonne National Laboratory (ANL)
Sponsoring Organization:
USDOE Office of Science - Office of Basic Energy Sciences - Materials Sciences and Engineering Division; U.S. Department of Commerce; Natural Sciences and Engineering Research Council of Canada (NSERC); National Institute of Standards and Technology (NIST); Office of Naval Research
DOE Contract Number:
AC02-06CH11357
OSTI ID:
1391783
Journal Information:
Phase Transitions, Journal Name: Phase Transitions Journal Issue: 3 Vol. 88; ISSN 0141-1594
Country of Publication:
United States
Language:
English

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Related Subjects

PMN
morphotropic phase boundary
neutron diffraction
phase diagram
relaxors
skin effect