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Articles

Intrinsic and extrinsic electric response in Bi0.5Na0.5TiO3- BaTiO3 lead-free piezoceramics

, , , , , & show all
Pages 156-163 | Received 14 Oct 2018, Accepted 03 Feb 2019, Published online: 10 Sep 2019
 

Abstract

(Bi0.5Na0.5)TiO3-BaTiO3 (BNT-BT) lead-free piezoelectric ceramics with compositions near the rhombohedral-tetragonal morphotropic phase boundary (MPB) have been prepared and investigated. In this work, the best properties was observed in BNT-0.07BT, with the piezoelectric coefficient d33 and the planar electromechanical coupling factor kp being 151 pC/N and 0.278, respectively. The dielectric response of the poled (Bi0.5Na0.5)TiO3-xBaTiO3 ceramics were investigated as a function of composition and temperature using Rayleigh analysis, dielectric Rayleigh coefficient α and initial dielectric constant εinit increase with x increasing, and has a substantial increase in the tetragonal phase. Detailed analysis of the temperature dependence of α and εinit curves of all compositions revealed different temperature in the maximum value due to the dominate contributions of domain wall motion.

Additional information

Funding

This work was supported by the National Key Basic Research Program of China (No. 2013CB632900), the National Science Foundation of China (Nos. 51575149, 51572056 and 51402075).

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