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)0.08Bi2Ta2O9 (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 (d33max∼12.8 pC/N) and ferroelectricity (Prmax∼7.4 μC/cm2) 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 d33 of CNCBT-NBT40 maintains 94% of its initial stage even the annealing temperature reaching at 900 °C. The TC of CNCBT-NBT100x exhibits a decreasing trend with the increasing doping concentration, but CNCBT-NBT40 still possesses a high TC (TC∼924.9 °C). The high-temperature electrical resistivity of CNCBT-NBT100x almost remains unchanged owing to the close band-gap energy, and the ρ of CNCBT-NBT40 is above 6 × 106 Ω∙cm at 600 °C. This work may provide a new way of designing the doping formula to improve comprehensive properties of Aurivillius ferroelectrics.