Dielectric breakdown of porous ceramics 

 -  Journal of Applied Physics, 30(11), p.1650-1653, 1959 .
<br/><br/> A statistical approach is used to determine the effect of porosity in ceramic materials on their dielectric breakdown strength. The calculated drop in dielectric strength is in good agreement with the experimental data for lead zirconate titanate ceramics. The theory shows that the measured dielectric strength in porous materials is a function of the porosity, the void size, and of the dimensions of the test sample.