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Composition dependent Rayleigh and structural analysis was carried out on thelead-free piezoceramics (1-x)(BaTi0.88Sn0.12)-x(Ba0.7Ca0.3)TiO3 at roomtemperature. The system exhibits tetragonal (P4mm) structure for x > 0.21,rhombohedral (R3m) for x < 0.13 and orthorhombic (Amm2) for 0.13<x<0.21.Rayleigh analysis suggests that the irreversible contribution to the dielectricresponse is enhanced in the single phase orthorhombic compositions in thevicinity of the R3m-Amm2 and Amm2-P4mm phase boundaries, and not incompositions exhibiting phase coexistences (x = 0.12 and 0.22). We also found acorrespondence between the irreversible Rayleigh parameter and the coercivefield in this system.

Correlation between structure and Rayleigh parameters in the lead-free piezoceramic (1-x)Ba(Ti0.88 Sn0.12)O3-x(Ba0.7Ca0.3)TiO3