The piezoelectric actuator/sensor is fabricated
on the deformable diaphragm as a vertical thick-film
structure, and consists of a bottom electrode, an
active PZT (Pb(Zr,Ti)O3) layer, and an upper
electrode. The PZT material for this structure is a
ferroelectric thick-film paste based on PZT 53/47
powder (PbZr0.53Ti0.47O3).