The maximum voltage you can apply depends on the strength of individual samples and there is no absolute answer for it. However, if you care about the maximum ampere, there is some answer for you. The maximum ampere materials generate is independent on the maximum voltage. The maximum ampere usually happens at coercive field of the materials (the voltage where major domain switching occurs) and its magnitude is proportional to the voltage increasing rate (voltage/time). Simply speaking, as long as you have the maximum field higher than the coercive field, you will have the maximum ampere. The higher you voltage increasing rate is, the larger ampere you get. Note, that the coercive field may increase if the rate increases.

For PZT, I am not sure what "metaniobate" means. But PZT stands for lead zirconate titanate.

I hope my answer helps.

The intensity of the maximum allowable field to piezoelectric ceramic is between 1 and 2 kV / mm in the polarization direction (usually 400V / mm). In the reverse direction, 300 V / mm maximum is allowed. Maximum voltage depends on the ceramic and insulation materials.

With regard to the amperage must work on the volume; about 1 A / mm3.

Lead zirconate titanate is an intermetallic inorganic compound with the chemical formula Pb[ZrxTi1-x]O3 (0≤x≤1). Also called PZT, it is a ceramic perovskite material that shows a marked piezoelectric effect, meaning that the compound is used in a number of practical applications in the area of electroceramics. PZT is a white solid that is insoluble in all solvents.

The maximum voltage depends on the pressure applied and the g33 coefficient.

The maximum amperage is a function of the cross sectional area perpendicular to the applied pressure (larger area = higher amps). It's just a simple circuits problem.

I have used PZT-4 , I applied a point time dependent load (

100*sin(2*3.1416*10[rad/s]*t) where i got generated voltage max 160V. But I am looking for a validation to cross check my result. How can I do it?

Are you using 100 cyclic loads?

Yes, I applied time dependent 100*sin(2*3.1416*10[rad/s]*t) N load, And the load was applied as point load on a cantilever beam. Also I measured point voltage on PZT-4 material.