Abstract
We report a giant piezoelectric constant (d33), 720 pC/N and converse piezoelectric constant (d33*), 2215 pm/V for 0.55(Ba0.9Ca0.1)TiO3-0.45Ba(Sn0.2Ti0.8)O3 ceramics; the biggest value achieved for lead free piezo-ceramics so far. The fitting combination of processing and microstructural parameters e.g. initial powder particle size 1-2µm, ceramics density ~95%, and large grain size ~67µm lead to formation of rhombohedral-orthorhombic-tetragonal-cubic multiphase coexistence near room temperature. These conditions significantly increase piezoelectricity, together with high relative permittivity (er) >5000 and low loss tangent (tan δ) of 0.029. These results imply that the (Ba,Ca)(Sn,Ti)O3 ceramics are strong contenders to substitute lead based materials for room temperature applications.
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