The Modification of (Nd0.5Ta0.5)4+ Complex-Ions on Structure and Electrical Properties of Bi0.5Na0.5TiO3-BaTiO3 Ceramics

Abstract

The (Bi 0.5 Na 0.5) 0.94 Ba 0.06 Ti 1-x (Nd 0.5 Ta 0.5) x O 3 (0.01≤x≤0.05) lead-free ceramics (BNBT-xNT) used (Nd 0.5 Ta 0.5) 4+ complexions to modify its structure and electrical properties. The BNBT-xNT ceramics exhibit the coexistence of tetragonal and rhombohedral phase. The (Nd 0.5 Ta 0.5) 4+ complexions prohibit grain growth, and its average grain size decreases from 2.53 µm to 0.84 µm with increasing complexion content. The NT doping not only induces the transformation from ferroelectric phase to relaxor ferroelectric phase but also decreases the coercive field and remnant polarization. The permittivity curves are broadened at heavily doping content. The energy storage and strain properties are improved by complexions. The maximum energy storage density of 0.475 J/cm 3 is obtained at x = 0.035 and 60 kV/cm, the energy storage efficiency achieves the maximum efficiency of 61.5% at x=0.05. As increasing complexion content, the typical butterfly-shaped strain curve develops into a sprout-shaped one, and the maximum strain of 0.199% is obtained at x=0.02.