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Bi-fluctuation in Na0.5Bi0.5TiO3 ferroelectric ceramics with abnormal relaxor behaviour.
- Source :
-
Philosophical Magazine . Nov2019, Vol. 99 Issue 21, p2661-2680. 20p. - Publication Year :
- 2019
-
Abstract
- The existence of Bi-fluctuation dispersing in Na0.5Bi0.5TiO3 (NBT) relaxor ferroelectric is hinted in other recent studies. However, this fluctuation has not been directly observed yet. We introduce the Bi-rich nano-regions with different sizes in a series of NBT ceramics by the slight excess of Bi3+ content. The crystal symmetries of the Bi-rich nano-regions and the NBT matrix are rhombohedral. The lattice parameters of the nano-regions are larger than those of the matrix in NBT ceramics, which were confirmed by the X-ray diffraction Rietveld refinement, TEM techniques and first-principles calculation. Also, the disorder-induced nano-regions appearing as Bi-fluctuation are associated with the complex phase transitions and the high-frequency relaxor behaviour of NBT suggested by the dielectric measurements and Raman spectra. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 14786435
- Volume :
- 99
- Issue :
- 21
- Database :
- Academic Search Index
- Journal :
- Philosophical Magazine
- Publication Type :
- Academic Journal
- Accession number :
- 138769759
- Full Text :
- https://doi.org/10.1080/14786435.2019.1637550