Abstract
High-resolution x-ray and neutron diffraction of (0.96)Na 0.5Bi 0.5TiO 3-(0.04)BaTiO 3 (NBT-4BT) reveal subtle structural distortions that evidence lower symmetry than allowed in the R3c space group. The combined refinement that best models the diffraction patterns is a two phase mixture of a monoclinic Cc phase and a minor fraction of a metrically cubic Pm 3 m phase (13 wt.%). The cubic phase is utilized to account for nanometer-scale regions whose local deviations from the long-range symmetry are not observed, such as polar nano-regions or tetragonal platelets. This suggests that the low symmetry found in the NBT-rich phases extends from 0 at. to at least 4 at. BT.
| Original language | English |
|---|---|
| Article number | 152906 |
| Journal | Applied Physics Letters |
| Volume | 101 |
| Issue number | 15 |
| DOIs | |
| State | Published - Oct 8 2012 |
Funding
This work was supported by the U.S. Department of the Army under W911NF-09-1-0435. Use of the Advanced Photon Source at Argonne National Laboratory was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. This research at Oak Ridge National Laboratory's High Flux Isotope was sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy. The authors would like to thank Dr. Elena Aksel for the x-ray diffraction measurements.
| Funders | Funder number |
|---|---|
| Scientific User Facilities Division | |
| U.S. Department of Energy | |
| Office of Science | |
| Basic Energy Sciences | DE-AC02-06CH11357 |
| Oak Ridge National Laboratory | |
| U.S. Army Medical Department | W911NF-09-1-0435 |