Abstract
Piezoelectric ceramics with high strain can convert electrical energy and mechanical energy into each other for a wide range of applications. (1-x)Bi0.5Na0.5TiO3-x(0.5Ba0.7Ca0.3TiO3-0.5BaTi0.8Zr0.2O3) (BNT-x(BCT-BZT)) lead-free piezoelectric ceramics were prepared through solid-state reaction methods. The structural, dielectric, field-induced strain and energy storage properties of the ceramics were investigated systematically by various characterization techniques. A large field-induced strain of 0.42% with negligible negative strain and large reverse piezoelectric coefficient of 547 pm/V are obtained in BNT-9(BCT-BZT) ceramics. A large recoverable energy storage of 3.49 J/cm3 under 360 kV/cm and high energy storage efficiency of 64.9% are achieved in the BNT-10(BCT-BZT) ceramics. It believes that the large strain with negligible negative strain is mainly due to the crossover of relaxor nonpolar state to ferroelectric polar state. We believe that the BNT-x(BCT-BZT) ceramics are favorable for the practical applications in the mobile electronic devices.
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