Journal
PHASE TRANSITIONS
Volume 88, Issue 3, Pages 283-305Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/01411594.2014.989226
Keywords
phase diagram; morphotropic phase boundary; skin effect; PMN; neutron diffraction; relaxors
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Funding
- United States Office of Naval Research (ONR) [N00014-12-1-1045]
- Natural Sciences and Engineering Research Council of Canada (NSERC) [203772]
- US Department of Energy, Office of Science, Basic Energy Sciences, Materials Science and Engineering Division [DE-AC02-06CH11357]
- Office of Basic Energy Sciences, US Department of Energy [DE-AC02-98CH10886]
- Engineering and Physical Sciences Research Council [EP/M01052X/1] Funding Source: researchfish
- EPSRC [EP/M01052X/1] Funding Source: UKRI
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We revisit the phase diagram of the relaxor ferroelectric PMN- [GRAPHICS] 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- [GRAPHICS] PT were prepared with nominal compositions of [GRAPHICS] , 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 [GRAPHICS] , 0.20, and 0.30 are best refined using the monoclinic [GRAPHICS] 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- [GRAPHICS] PT vanishes on the Ti-rich side of the morphotropic phase boundary.
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