Fig. 1. Section schematic of the Y₂Hf₂O₇ ceramic cathode. 磁控管用新型铪酸钇陶瓷阴极剖面结构示意图

Fig. 2. Schematic of the thermionic emission testing system for the Y₂Hf₂O₇ ceramic cathode. 铪酸钇陶瓷阴极热发射测试装置示意图

Fig. 3. I-V curves of the Y₂Hf₂O₇ ceramic cathode. 直流发射电流密度随阳极电压变化曲线

Fig. 4. Lifetime curve of the Y₂Hf₂O₇ ceramic cathode. 阴极寿命特性曲线

Fig. 5. curves of the Y₂Hf₂O₇ ceramic cathode 铪酸钇陶瓷阴极 曲线

Fig. 6. Richardson curves of the Y₂Hf₂O₇ ceramic cathode. 铪酸钇陶瓷阴极理查森直线

Fig. 7. SEM image of the active substance.电子发射活性物质SEM微观结构形貌图

Fig. 8. EDS spectrum and element content of the active substance.电子发射活性物质EDS谱图及含量

Fig. 9. XRD spectrum of the active substance.电子发射活性物质XRD谱图

Fig. 10. SEM image of the Y₂Hf₂O₇ ceramiccathode. 铪酸钇陶瓷阴极表面SEM微观结构形貌图

Fig. 11. EDS spectrum and element content the cathode.铪酸钇陶瓷阴极表面EDS谱图及含量

Fig. 12. AES spectrum the Y₂Hf₂O₇ ceramic cathode. 铪酸钇陶瓷阴极表面AES谱图

Fig. 13. Element content as a function of the depth from the cathode surface: (a) O element; (b) Y and Hf element.不同元素含量随阴极表面深度的变化曲线　(a) O元素; (b) Y和Hf元素

Fig. 14. Energy band diagram of the Y₂Hf₂O₇ ceramic cathode. 铪酸钇陶瓷阴极表面能带示意图