Hello, This is my first post so I hope I do everything correctly. I am required to calculate the RC time constant in piezoelectrics. I am trying to do this with data that I already have, Resistivity (not resistance) and Permittivity, and I no longer have the dimensions of the sample that I tested the permittivity on. I assume it can be done as the resistivity is geometry dependent unlike resistance and permittivity isn't unlike capacitance. I have the polarization (microCoulombs/cm squared), I suppose I can get the capacitance from this but this is more time consuming. I have two questions. a) Can it be done? b) The resistivity and permittivity are field dependent as well as frequency dependent so is there a standard measuring field and frequency that is used? Kind regards, Thanks.