Abstract
Two new perovskites, (Bi0.5A0.5)(Sc0.5Nb0.5)O3 where A = K+ and Na+, have been made phase pure for the first time. The synthesis procedure that prevented the formation of pyrochlore impurities is described. B-site ordering in A = K+ is successfully achieved by prolonged heating. Combined Rietveld refinement on synchrotron X-ray diffraction and neutron diffraction data is used to determine the complex average structure of these materials. A = Na+ crystallizes in the tetragonal P4/mbm space group and has disordered a0a0c+ rotations of BO6 octahedra. A = K+ crystallizes in the cubic Pm3m space group, but shows local A-site displacements in the [100] direction. Both materials are highly disordered but illustrate the potential of (A)NbO3-BiScO3 solid solutions as useful piezoelectrics or relaxors.
| Original language | English |
|---|---|
| Pages (from-to) | 1033-1044 |
| Number of pages | 12 |
| Journal | Inorganic Chemistry Frontiers |
| Volume | 5 |
| Issue number | 5 |
| DOIs | |
| State | Published - May 2018 |
| Externally published | Yes |
Funding
Michelle Dolgos and Alicia Manjón-Sanz would like to thank the NSF (DMR-1606909) for support. T. Thao Tran would like to thank the NSF (DMR-1503573) for support. The authors would like to thank the Halasyamani Group at University of Houston for their SHG analysis and to Dr Halasyamani for his useful discussion. 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 used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory. We would like to thank Saul Lapidus and Lynn Ribaud of 11-BM at the APS and Ashfia Huq, Pam Whitfield, and Melanie Kirkham of POWGEN at the SNS for their assistance with our experiments.