Hello all,
   I making a theoretical study of Piezoelectric actuators. Can
anybody tell me what is the maximum deflection that is achievable in a
piezoelectric membrane compared to its dimensions.What materials we
can use for it???
  Is electrostatic membranes deflect more compared to a piezoelectric
membrane actuator.
( The voltage supplied to the electrodes in both actuators are assumed
comparable)

  If I want my Piezoelectric membrane to deflect both in upper and
lower directions.will it work if I apply a sinusoidal voltage to the
electrodes?????. Or is there is any special fabrication procedures for
that.
Any papers which covers any of these questions will be greatly helpful.
                                             Thank You

Allwyn Boustheen