## Grain size effect on the high field properties of (Ba,Ca)(Ti,Zr)O3 ceramics

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Abstract
08-048 Lavinia Curecheriu Curecheriu, L.(Alexandru Ioan Cuza University); Buscaglia, M.T.(Institute of Condensed Matter Chemistry and Technologies for Energy); Canu, G.(Institute of Condensed Matter Chemistry and Technologies for Energy); Buscaglia, V.(Institute of Condensed Matter Chemistry and Technologies for Energy); MITOSERIU, L.(Al. I. Cuza University of Iasi);
Grain size effect on the high field properties of $\left(\mathrm{Ba},\mathrm{Ca}\right)\left(\mathrm{Ti},\mathrm{Zr}\right){\mathrm{O}}_{3}$ceramics

Lavinia Curecheriu1, Maria Teresa Buscaglia2, Giovanna Canu2, Vincenzo Buscaglia2, Liliana Mitoseriu2 1Dielectrics, Ferroelectrics& Multiferroics Group, Departament of Physics, Al.I. Cuza University, 11 Bv. Carol I, 700506, Iasi, Romania
2Institute of Condensed Matter Chemistry and Technologies for Energy ICMATE-CNR, Via de Marini 6, Genoa, Italy

One of the most promising BT-based materials for piezoelectric applications is the pseudobinary ferroelectric $\left(1-x\right)Ba\left(Z{r}_{0.20}T{i}_{0.80}\right){O}_{3}-x\left(B{a}_{0.70}C{a}_{0.30}\right)Ti{O}_{3}$ (BCTZ) (x is the molar percent of BCT). In the present paper, we present high field properties (dc-tunability, piezoelectric and ferroelectric characteristics) of  $B{a}_{0.85}C{a}_{0.15}T{i}_{0.90}Z{r}_{0.10}{O}_{3}$ ceramics with grain size larger than 1?m. The ceramics were prepared by sintering solid state powders at different temperatures between 1400-1500°C and times (from 0.2-24 hours). The grain size of ceramics determined from SEM images were between 2 ?m for the samples sintered at 1400ºC/2h to 27 ?m for the samples obtained at 1500ºC /24h. The piezoelectric properties are dependent on the poling conditions (poling temperature and electric field) and grain size. Polarization vs. electric field (P-E) hysteresis loop study showed that exist a critical grain size (~ 9 ?m) for which the remnant and saturation polarisation is higher. The same critical size was obtained from dc-tunability investigation. The presented data provide a complete picture of the size effect dependence of the high field properties in $B{a}_{0.85}C{a}_{0.15}T{i}_{0.90}Z{r}_{0.10}{O}_{3}$.
Acknowledgment: The financial support of the PN III-P1-1.1-TE-2016-1951 is acknowledged.
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