快极化反转在铁电阴极电子发射过程中具有决定性的作用 ,本工作采用XRD ,SEM等方法研究铁电发射机理 ,XRD图谱、晶胞参数测试结果以及扫描电镜观察到的电畴排列状况等从多个角度反映出不同铁电材料在电子发射前、后的晶体结构及电畴结构的相应变化状况 ,对实验结果的分析有助于理解铁电阴极电子发射机理以及性能与组成、结构之间的关系 . Fast polarization reversal plays a decisive role in the electron emission of ferroelectric cathodes. In this work, the emission mechanism, XRD patterns and unit cell parameters of the ferroelectric emission were studied by XRD and SEM. And so on from a number of perspectives reflect the different ferroelectric materials before and after the electron emission of the crystal structure and the corresponding changes in the structure of the domain, the experimental results of the analysis helps to understand the ferroelectric cathode electron emission mechanism and the performance and composition, structure The relationship between .