Enhanced Piezoelectric Properties of Tetragonal (Bi1/2K1/2)TiO3 Lead‐Free Ceramics by Substitution of Pure Bi‐Based Bi(Mg2/3Nb1/3)O3. Issue 1 (24th September 2014)

• Record Type: Journal Article
• Authors: Pan, Zhao; Wang, Qi; Chen, Jun; Liu, Chuang; Fan, Longlong; Liu, Laijun; Fang, Liang; Xing, Xianran; Viehland, D.
• Is Part Of: Journal of the American Ceramic Society. Volume 98:Issue 1(2015)
• Page Start: 104
• Page End: 108
• Publication Date: 2014-09-24
• Subjects: Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.13255
• Languages: English
• ISSNs: 0002-7820

Abstract

<abstract abstract-type="main" id="jace13255-abs-0001"> <title> <x xml:space="preserve">Abstract</x> </title> <p>Crystal structure, piezoelectric, and dielectric properties were investigated in the new lead‐free BKT‐based piezoelectric ceramics of (1−<italic>x</italic>)(Bi_1/2K_1/2)TiO₃‐<italic>x</italic>Bi(Mg_2/3Nb_1/3)O₃. The morphotropic phase boundary (MPB) of the system between tetragonal and rhombohedral phases lies near the composition of <italic>x </italic>=<italic> </italic>0.02. The optimal piezoelectric property of small‐signal <italic>d</italic>₃₃ is much enhanced to be 96 pC/N (<italic>x </italic>=<italic> </italic>0.01), which is higher than any other BKT‐based compositions. By the introduction of Bi(Mg_2/3Nb_1/3)O₃, the ceramics exhibit a lower coercive field <italic>E</italic>_C. In addition, a relaxor‐like behavior with a frequency‐dependent Curie temperature <italic>T</italic>_m is observed, and high Curie temperature <italic>T</italic>_m around 380°C is obtained in the investigated system. This study suggests that the piezoelectric properties of BKT can be significantly improved by the means of Bi(Mg_2/3Nb_1/3)O₃ substitution.</p> </abstract>