Abstract
Dielectric, ferroelectric, and piezoelectric properties between 0.33Ba0.8Ca0.2TiO3–0.67BaTi1−x Zr x O3 (BCT–BZT) and Ba0.934Ca0.066Ti1−x Zr x O3 (BCZT) lead-free ceramics, which were sintered at 1260 °C in atmosphere with different as-prepared nanoparticles, were studied. XRD results showed the evidence of the phase transitions and morphotropic phase boundary (MPB) regions of BCT–BZT and BCZT ceramics. The phase transitions in the triple point showed a sensitive variation of electric properties around MPB regions. The excellent electric properties (e r = ~9000, P r = 35.6 μC/cm2, and d 33 = ~240 pC/N) were found in BCT–BZT ceramics. Spontaneous polarization states, defect dipole, and pinch effect were considered to be the important factors that influenced the electric properties. Moreover, study on the excellent electric properties around the triple point of BaTiO3-based ceramics by different process would give a proposal for their practical production.
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