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Abstract
The dielectric properties of nanocrystalline Bi3.97Na0.1Ti3O12 with different grain sizes have been investigated as a function of temperature. Three anomalous peaks are found, which are obviously different from that in nanocrystalline Bi4Ti3O12. The first peak disappears when the grain size is larger than 23 nm, and is considered to be caused by the coexistence of the ordered and disordered Na doped phases in nanocrystalline Bi3.97Na0.1Ti3O12. The second one shows no dependence on grain size and corresponds to ferroelectric-antiferroelectric structure phase transition, while the antiferroelectric domain phase transition happens at higher temperature. The last peak, corresponding to antiferroelectric-paraelectric phase transition, increases its temperature monotonically with increasing grain size, which is in contradiction with the nanocrystalline Bi3.97Na0.1Ti3O12. Further study on dielectric properties of Bi3.97Na0.1Ti3O12 ceramics confirms structural and domain contributions to the dielectric response.