Effect of Porosity on Functional Properties of Lead-Free Piezoelectric BaZr(0.15)Ti(0.85)O(3) Porous Ceramics

The present paper reports the dependence of dielectric, ferroelectric and piezoelectric properties on the porosity level in BaZr(0.15)Ti(0.85)O(3) ceramics with porosity from 5% to 21%. Microporosity with 0–3 connectivity has been produced using PMMA microspheres as a sacrificial template. The functional properties (dielectric, ferroelectric and piezoelectric effect) are mostly affected by the “dilution effect”: permittivity decreases by 40% when porosity increases by 21%, and P(max) decreases from 13 to 5 µC/cm(2) while the P(rem) is in the range of (2–8) µC/cm(2). However, the reduction of the zero-field permittivity and hysteretic behaviour of ε(E) while the tunability level is still high makes from porous ceramics interesting materials for tunability application.