A structural model for the relaxor PbMg1/3Nb2/3O3at 5 K
- 21 October 1991
- journal article
- Published by IOP Publishing in Journal of Physics: Condensed Matter
- Vol. 3 (42), 8159-8171
- https://doi.org/10.1088/0953-8984/3/42/011
Abstract
The perovskite structure of the relaxor PbMg1/3Nb2/3O3 (PMN) is studied using X-ray and neutron powder diffraction data. The static diffuse scattering (SDS) observed in the diffraction patterns at low temperatures is interpreted using a two-phase Rietveld analysis. The structural model is based on a long-range structure with an average cubic symmetry, and a short-range order due to atomic shifts involved by the formation of polar regions. The two-phase model provides a good improvement in reliability factors. The correlation length and the coexistence of different phases at low temperatures are discussed.Keywords
This publication has 19 references indexed in Scilit:
- X-ray and neutron diffraction studies of the diffuse phase transition in ceramicsJournal of Solid State Chemistry, 1991
- Short-range order in
1 3 Nb2 3 OMaterials Research Bulletin, 1990 - On the changes in structure of PLZT(8.7/65/35) between 80 and 750 KPhysica Status Solidi (a), 1989
- TEM studies of Pb(Mg1/3Nb2/3)O3-PbTiO3ferroelectric relaxorsFerroelectrics, 1989
- Transitions in the glassy ferroelectric PLZT (8.7/65/35)Journal of Physics C: Solid State Physics, 1988
- Crystalline ferroelectrics with glassy polarization behaviorPhysical Review B, 1983
- Fabrication of perovskite lead magnesium niobateMaterials Research Bulletin, 1982
- An optical study of the ferroelectric relaxors Pb(Mg1/3Nb2/3)O3, Pb(Sc1/2Ta1/2)O3, and Pb(Sc1/2Nb1/2)O3Ferroelectrics, 1981
- A new computer program for Rietveld analysis of X-ray powder diffraction patternsJournal of Applied Crystallography, 1981
- A profile refinement method for nuclear and magnetic structuresJournal of Applied Crystallography, 1969