To further evaluate the chemical co

To further evaluate the chemical compatibility with metallic electrode, the as cold sintered sample is co-fired with Ag colloids at 800 ◦C for 3 h and the XRD pattern and SEM image of the LiF-Ag composite are shown in Fig. 4. All diffraction peaks are assigned to LiF and Ag, indicating excellent chemical compatibility. The SEM image presents a discrete boundary between LiF and Ag, which is confirmed from the concentration profiles as functions of distance on both sides of the interface. Moreover, the element mapping result shown in Fig. 4(c) could further confirm the excellent chemical compatibility between LiF and Ag.