Fig. 1. Powder X-ray diffraction patterns of precursor before and after SPS process, insets are digital pictures of the precursor and the obtained electride.C12A7+CA混合前驱体烧结前后XRD与实物照片

Fig. 2. SEM images of the sintered C12A7:e^– ceramic. C12A7:e^–扫描照片

Fig. 3. (a) EPR spectra of the sintered C12A7 bulk; (b) optical absorption spectra of the sintered C12A7:e^– powders. (a) 样品的顺磁共振图谱; (b) 样品的紫外吸收光谱

Fig. 4. (a) Emission current density as a function of electric field at various in the range of 973 to 1373 K; (b) Schottky plots at various temperatures, fitting of the curves result in zero field emission current density at each temperature; (c) Richardson plot of the sample; (d) scatter plot of the emission current density versus time.(a) 不同温度下发射电流密度随电场强度的变化; (b) 零场电流密度的拟合直线; (c) Richardson直线; (d) 发射稳定性曲线