Composition‐ and Temperature‐Dependent Large Strain in (1−x)(0.8Bi0.5Na0.5TiO3–0.2Bi0.5K0.5TiO3)– xNaNbO3 Ceramics. Issue 4 (26th December 2014)

• Record Type: Journal Article
• Authors: Dong, Guangzhi; Fan, Huiqing; Shi, Jing; Li, Mengmeng; Jo, W.
• Is Part Of: Journal of the American Ceramic Society. Volume 98:Issue 4(2015)
• Page Start: 1150
• Page End: 1155
• Publication Date: 2014-12-26
• Subjects: Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.13407
• Languages: English
• ISSNs: 0002-7820

Abstract

<abstract abstract-type="main" id="jace13407-abs-0001"> <title> <x xml:space="preserve">Abstract</x> </title> <p>Ternary solid solutions of (1 − <italic>x</italic>)(0.8Bi_0.5Na_0.5TiO₃–0.2Bi_0.5K_0.5TiO₃)– <italic>x</italic>NaNbO₃ (BNKT–<italic>x</italic>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 <italic>T</italic>_F‐R shifted down below room temperature as the substitution of NN, a compositionally induced nonergodic‐to‐ergodic relaxor transition was presented, which featured the pinched‐shape polarization and sprout‐shape strain hysteresis loops. A strain value of ~0.445% (under a driving field of 55 kV/cm) with large normalized strain of ~810 pm/V was obtained for the composition of BNKT–0.04NN, and the large strain was attributed to the reversible electric‐field‐induced transition between ergodic relaxor and ferroelectric phase.</p> </abstract>