We suggest that as lead-free cathode materials, BNBT and BT outweigh PZT from environmental consideration in spite of the fact that the field emission current density of PZT is slightly higher than that of both BNBT and BT.

• 结果认为:锆钛酸铅材料的电子发射电流密度略优于其他两种材料,但从无铅化角度来讲,钛酸钡与钛酸铋钠材料将有望取代现有的锆钛酸铅铁电阴极材料。