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Bi 0.47 Na 0.47 Ba 0.06 Ti 1-x (Ni 1/3 Nb 2/3 ) x O 3  ceramics (abbreviated as BNBT 1-x (NN) x , x = 0, 0.01, 0.03 and 0.05) were synthesized by solid-state combustion. The effect of x on the phase formation, microstructure and electrical properties of BNBT 1-x (NN) x  ceramics was examined. The XRD pattern indicated the coexistence of rhombohedral and tetragonal phases in all the specimens. Moreover, Rietveld refinement confirmed that the tetragonal phase increased from 47 to 71% when x increased from 0 to 0.05. The morphology of BNBT 1-x (NN) x  ceramics was observed by SEM and the ceramics grains showed polygonal shapes and the grain growth tended to be anisotropic. With (NiNb) 4+  substitution, the average grain sized decreased rapidly from 1.7 to 1.0 µm and the grain size distribution was narrower as the amount of (NiNb) 4+  increased. The density, remnant polarization (P r ) and coercive field (E c ) rapidly decreased with increasing x. A significant decrease in the ferroelectric properties was caused by the increasing tetragonal phase.

ferroelectrics

Effect of substitution of (NiNb) 4+  into B-sites on the phase formation, microstructure and electrical properties of Bi 0.47 Na 0.47 Ba 0.06 TiO 3  ceramics