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We report the phase diagram of (Ba1-xCax)(Zr0.1Ti0.9)O3 solid solution. It isfound that substitution of smaller Ca ions for Ba ions can slightly increasethe cubic-tetragonal(T) para-ferroelectric phase transition temperature andstrongly decrease the T-orthorhombic (O) and O-rhombohedral (R) transition.This unique ferroelectric phase evolution is attributed to Ca off-centeringeffects. More importantly, lowering of the T-O or O-R phase transitions allowsus to prepare the piezoelectric ceramics with a strain response as high asS/E~800 pm/V (E=10 kV/cm) over a wide range of compositions with x~0.1 - 0. 18at room temperature, which may be interesting for piezoelectric applications.

Phase diagram and piezoelectric response of (Ba1-xCax)(Zr0.1Ti0.9)O3 solid solution