Realization of high electric performance in Aurivillius ferroelectrics via combining chemical substitution and the construction of new-type solid solution systems

Aurivillius ferroelectrics, Ca0.92-x(Na0.5Bi0.5)x(Na0.5Ce0.5)(0.08)Bi2Ta2O9 (CNCBT-NBT100x, x = 0, 0.02, 0.04, 0.06, 0.08, 0.10, 0.20, 0.30 and 0.40) ceramics were prepared by conventional electroceramic processing procedures. The novel Aurivillius ferroelectrics possess a gradual improving piezoelectricity (d(33max)-12.8 pC/N) and ferroelectricity (P-rmax-7.4 mu C/cm(2)) with the introduction of (Na0.5Bi0.5)(2+) content. Moreover, the addition of (Na0.5Bi0.5)(2+) also improves the temperature stability of piezoelectric activity obviously. The d(33) of CNCBT-NBT40 maintains 94% of its initial stage even the annealing temperature reaching at 900 degrees C. The TC of CNCBT-NBT100x exhibits a decreasing trend with the increasing doping concentration, but CNCBT-NBT40 still possesses a high T-C (T-C-924.9 degrees C). The high-temperature electrical resistivity of CNCBT-NBT100x almost re-mains unchanged owing to the close band-gap energy, and the rho of CNCBT-NBT40 is above 6 x 10(6) Omega.cm at 600 degrees C. This work may provide a new way of designing the doping formula to improve comprehensive properties of Aurivillius ferroelectrics.