Journal
PHYSICAL REVIEW B
Volume 86, Issue 22, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.86.224111
Keywords
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Funding
- Office of Naval Research [N00014-02-1-0506, N00014-06-1-0166, N00014-07-1-0451, N00014-11-1-0552]
- Carnegie/Department of Energy Alliance Center (CDAC) [DE-FC03-03NA00144]
- EFree, an Energy Frontier Research Center
- U.S. Department of Energy, Office of Science, Office of Basic Energy Science [DE-SC0001057]
- U.S. Department of Energy [DE-AC02-06CH11357]
- DOE-NNSA
- DOE-BES
- NSF
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We combine high-pressure x-ray diffraction, high-pressure Raman scattering, and optical microscopy to investigate a series of (1 - x)Pb(Mg1/3Nb2/3)O-3-xPbTiO(3) (PMN-xPT) solid solutions (x = 0.2, 0.3, 0.33, 0.35, 0.37, 0.4) in diamond anvil cells up to 20 GPa at 300 K. The Raman spectra show a peak centered at 380 cm(-1) starting above 6 GPa for all samples, in agreement with previous observations. X-ray diffraction measurements are consistent with this spectral change indicating a structural phase transition; we find that the triplet at the pseudocubic (220) Bragg peak merges into a doublet above 6 GPa. Our results indicate that the morphotropic phase boundary region (x = 0.33 - 0.37) with the presence of monoclinic symmetry persists up to 7 GPa. The pressure dependence of ferroelectric domains in PMN-0.32PT single crystals was observed using a polarizing optical microscope. The domain wall density decreases with pressure and the domains disappear at a modest pressure of 3 GPa. We propose a pressure-composition phase diagram for PMN-xPT solid solutions. DOI: 10.1103/PhysRevB.86.224111
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