讨论了不同发射机理对铁电阴极材料性能的要求,对PZT(锆钛酸铅)系铁电陶瓷工艺过程中的关键步骤进行了研究.通过掺杂改性和改进预烧条件等手段,有效地改善了材料的性能参数,制备出相对介电常数大于3 000的弛豫相铁电陶瓷和压电常数大于500×10^-12C/N的铁电相铁电陶瓷.在初步的发射实验中,使用改进工艺后的PLZT8/65/35制备的铁电阴极,触发脉冲5.4 kV时,获得的发射电子电流密度达到800 A/cm²,远大于C-L定律计算的发射电流.

The mechanism of emission from ferroelectric cathode was introduced. With the purpose of obtaining the ferroelectric cathode material with large emission current density, the preparation conditions of PZT series ceramic were studied. By doping, modifying and some other methods of processing amelioration, the improvement of performance was observed in both ferroelectric and relaxor ferroelectric ceramic. In the preliminary experiment, with 5.4 kV external pulsed voltage, the electron emission density of PLZT8/65/35 reached up to 800 A/cm², which was much greater than that calculated by C-L principle.