Composition‐ and Temperature‐Dependent Large Strain in (1−x)(0.8Bi0.5Na0.5TiO3–0.2Bi0.5K0.5TiO3)– xNaNbO3 Ceramics

• DOI: 10.1111/jace.13407
• Publication Date: 2014-12-26T07:09:02Z
• Authors: Guangzhi Dong; Huiqing Fan; Jing Shi; Mengmeng Li
• Keywords: Hysteresis; Strain (injury)

Ternary solid solutions of (1 − x )(0.8Bi 0.5 Na TiO 3 –0.2Bi K )– NaNbO (BNKT– NN) lead‐free piezoceramics were fabricated using a conventional solid‐state reaction method. Pure BNKT composition exhibited an electric‐field‐induced irreversible structural transition from pseudocubic to ferroelectric rhombohedral phase at room temperature. Accompanied with the ferroelectric‐to‐relaxor temperature T F‐R shifted down below as substitution NN , compositionally induced nonergodic‐to‐ergodic relaxor was presented, which featured pinched‐shape polarization and sprout‐shape strain hysteresis loops. A value ~0.445% (under driving field 55 kV/cm) large normalized ~810 pm/V obtained for –0.04 attributed reversible between ergodic phase.