Bi-fluctuation in Na0.5Bi0.5TiO3 ferroelectric ceramics with abnormal relaxor behaviour |
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| Authors: | Huijiadai Luo Hongjun Zhang Liwei Zhang Fangzhe Li Lu Cao |
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| Affiliation: | 1. Institute for Advanced Ceramics, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, People’s Republic of China;2. Key Laboratory of Advanced Structural-Functional Integration Materials &3. Green Manufacturing Technology, Harbin Institute of Technology, Harbin, People’s Republic of China |
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| Abstract: | ABSTRACTThe 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. |
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