Estimation of lateral velocity of plasma diffusion on surface of ferroelectric cathode

The changes of the capacitance of ferroelectric cathode under high trigger voltage are analyzed. The change is the plasma diffusion along the surface of top electrode under high trigger voltage. The model of the equivalent capacitance of ferroelectric cathode is established. And on this basis, the equation of the lateral velocity of the plasma diffusion is derived. An antiferroelectric cathode material, lanthanum-doped lead zirconate stannate titanate is prepared by using the method of solid-state calcinations. The lateral velocity of the plasma diffusion is calculated by measuring the voltage and charge-recharge current of ferroelectric cathode under trigger voltage of La-doped Pb(Zr, Sn, Ti)O3 ferroelectric cathode. The result is about 1.89106 cm/s.