Processing optimization for (Ba, Ca)(Ti,Zr)O3 based lead free piezoelectric ceramics

Reference Presenter Authors
06-092 Anne Louise LERICHE ORLIK, K.(University of Valenciennes); LERICHE, A.L.(University of Valenciennes); Lorgouilloux, Y.(University of Valenciennes); Rguiti, M.(University of Valenciennes); Courtois, C.(University of Valenciennes);

For the last decades, lead piezoelectric ceramics, PbZr(1-x)TixO3 (PZT), are used like transducers, sensors, etc.

Giant piezoelectric properties (? 700pC/N) and a high Curie temperature (? 360°C) near the morphotropic phase boundary (x ? 0.5) characterize these materials. More recently, an upward surge occurs to explore lead-free based piezoelectric materials for many technological applications, as lead is toxic and non-environmental friendly. One of them is modified BaTiO3 as (1-x)Ba(Ti0.8Zr0.2)O3-x(Ba0.7Ca0.3)TiO3 (abbreviated as BCTZ) which exhibits high piezoelectric constant but a low Curie temperature. However, the applications concerning these materials are restricted compared in PZT. Nevertheless, they are promising candidates for specific applications like room-temperature sensors.

The purpose of this work is to investigate the best compromise between Curie temperature and piezoelectric properties by changing the composition and by optimizing the ceramic process (solid state route, attrition milling, calcination, sintering, poling) ;

The influence of each synthesis parameters on microstructure and piezoelectric properties will be presented and compared to the literature.