Studies on effect of dielectric coating on the triple junction electric field in ferroelectric cathodes

In this paper, the structure of ferroelectric cathode with a low dielectric constant film introduced between the ferroelectric material and the grid has been studied for increasing the triple junction electric field. Finite Element software ANSYS electric module is used for modeling of ferroelectric cathodes and basic geometry that was modeled is depicted in Figure 1. A voltage is applied on the rear side of the ferroelectric material to create a field of 20 kV / cm. The dielectric constant of the ferroelectric is taken as 1000 in the analysis. Though no ferroelectric property of the sample is utilized in the simulation carried out except for its high dielectric constant, it is referred as ferroelectric to differentiate between the top layers with low dielectric constant.