Abstract: A new promising lead-free piezoelectric ceramics (Bi0.5Na0.5)0.93Ba0.07Ti1-x(Nb0.5Cr0.5)xO3 (mole fraction x=0%, 0.5%, 1%, 2%, 2.5%, 5%) (abbreviated as BNBT-xNC) were prepared by the conventional solid-phase synthesis method. The effect of ionic pair (Nb5+-Cr3+) on microstructures, dielectric properties, and ferroelectric properties as well as strain properties of 0.93Bi0.5Na0.5TiO3-0.07BaTiO3 (abbreviated as BNT-7BT) ceramics was systematically investigated. The results show that all composition exhibits a single pseudo-cubic structure. The electrical properties reveal that the ferroelectric relaxor characteristics of BNBT-xNC ceramics change significantly with different ionic pair (Nb5+-Cr3+) substitution. The increasing ionic pair (Nb5+-Cr3+) modification induces two transitions from non-ergodic relaxor state (0%≤x≤1%) to coexistence of non-ergodic-ergodic relaxor state (1%≤x≤2%), and finally to ergodic relaxor state (2.5%≤x≤5%). The ionic pair (Nb5+-Cr3+) modification induces BNBT-xNC ceramics transition from ferroelectric state to relaxor state, and strain properties first increase and then decrease. A low dose of ionic pair (Nb5+-Cr3+) substitution enhances the strain propertites of BNBT-xNC ceramics, and the BNBT-xNC ceramics with x=2% exhibits the maximum strain (Smax=0.22%) and inverse piezoelectric constant (d*33=431 pm/V). The evolution of electrical properties associates with micostucture, which provides a new sight to investigate the effect of the ionic pair doping on BNT-BT ceramics.
Key words: BNT-BT ceramics, ionic pair doping, microstructure, dielectric property, ferroelectric property, strain property
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