Journal
PHYSICAL REVIEW B
Volume 81, Issue 14, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.81.144102
Keywords
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Funding
- Office of Naval Research [N00014-07-1-0451, N00014-02-1-0506]
- Carnegie/Department of Energy Alliance Center (CDAC) [DE-FC0303NA00144]
- (U.S.) Department of Energy [DE-AC02-06CH11357]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [805056] Funding Source: National Science Foundation
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High-pressure and variable temperature single-crystal synchrotron x-ray measurements combined with first principles based molecular-dynamics simulations were used to study diffuse scattering in the relaxor ferroelectric system PbSc1/2Nb1/2O3. Constant temperature experiments show a pressure-induced transition to the relaxor phase, in which butterfly- and rod-shaped diffuse scattering occurs around the {h00} and {hh0} Bragg spots. Simulations qualitatively reproduce the observed diffuse scattering features as well as their pressure-temperature behavior and show that they arise from polarization correlations between chemically ordered regions, which in previous simulations were shown to behave as polar nanoregions. Simulations also exhibit radial diffuse scattering [elongated toward and away from Q=(000)] that persists even in the paraelectric phase; consistent with previous neutron experiments on PbMg1/3Nb2/3O3.
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