Structure evolution and electrical properties of lead-free Bi_(0.5)Na_(0.41)K_(0.09)TiO_3 piezoceramics by isovalent La doping

摘要

This study investigated the structure evolution, surface morphology, dielectric properties, ferroelectric properties, piezoelectric properties, and electromechanical strain properties of lead-free (Bi_(0.5-x)La_x)(Na_(0.41)K_(0.09))TiO_3 piezoelectric ceramics. All samples were fabricated by a traditional solid-state synthesis. The effects of La~(3+)-isovalent substituted on Bi~(3+)-site of the Bi_(0.5)Na_(0.41)K_(0.09)TiO_3 system were examined. The addition of La doping in the Bi_(0.5)Na_(0.41)K_(0.09)TiO_3 ceramics induced the second phase of K_4Ti_3O_8 and a crystal structural change from the rhombohedral and tetragonal phase to a pseudocubic phase. All samples show similar grain morphology and dense microstructure with the average grain size around 1.33 to 1.61 μm. The dielectric curves and field-induced polarization loops of samples confirm the nonergodic-to-ergodic relaxor phase transformation, corresponding to the reduction of the temperature at the phase transition from ferroelectric to relaxor phase and the disruption of the ferroelectric properties happened in samples when increasing La~(3+) content. Besides, the maximum piezoelectric constant of 139 pC/N was found in (Bi_(0.48)La_(0.02))(Na_(0.41)K_(0.09))TiO_3 ceramic, while the (Bi_(0.46)La_(0.04))(Na_(0.41)K_(0.09))TiO_3 ceramic shows a maximum strain of ~ 0.2% at a low field of 40 kV/cm.