Dynamics and Structure of PMN and PZN
A review is given of recent neutron and x-ray scattering studies of the lead-oxide perovskite relaxor systems Pb(Zn{sub 1/3}Nb{sub 2/3})O{sub 3-x}PbTiO{sub 3} and Pb(Mg{sub 1/3}Nb{sub 2/3})O{sub 3-x}PbTiO{sub 3}. X-ray measurements by Noheda et al. have established that these two systems exhibit nearly identical phase diagrams in which a rhombohedral-monoclinic-tetragonal structural sequence takes place with increasing PbTiO{sub 3} concentration. Recent high-energy x-ray and neutron measurements on single crystals of PZN and PMN-10PT, however, show that the rhombohedral distortions occur only in the outermost 20-40 microns, while the bulk of each crystal transforms into a new phase X, which has a nearly cubic unit cell. This situation is very similar to the structural behavior of pure PMN at T{sub c} = 220 K. A simple model has been suggested that correlates phase X to the unique atomic displacements of the polar nanoregions, which are created at the Burns temperature.
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source
- Sponsoring Organization:
- Doe - Office Of Science
- DOE Contract Number:
- DE-AC02-98CH10886
- OSTI ID:
- 913793
- Report Number(s):
- BNL-78361-2007-JA; TRN: US0801380
- Journal Information:
- Ferroelectr., Vol. 321
- Country of Publication:
- United States
- Language:
- English
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