Composition-induced phase evolution and high strain response in Ba(Zn1/3Nb2/3)O3-modified (Bi0.5Na0.5)TiO3-based lead-free ferroelectrics

Qiumei Wei; Mankang Zhu; Tianhe Qin; Zhihua Guo; Mupeng Zheng; Yudong Hou; Hui Liu; Jun Chen

doi:10.1039/c8ra00653a

Composition-induced phase evolution and high strain response in Ba(Zn_1/3Nb_2/3)O₃-modified (Bi_0.5Na_0.5)TiO₃-based lead-free ferroelectrics

RSC Adv. 2018 Mar 29;8(22):12269-12275. doi: 10.1039/c8ra00653a. eCollection 2018 Mar 26.

Authors

Qiumei Wei¹, Mankang Zhu¹, Tianhe Qin¹, Zhihua Guo¹, Mupeng Zheng¹, Yudong Hou¹, Hui Liu², Jun Chen²

Affiliations

¹ College of Materials Science and Engineering, Beijing University of Technology Beijing 100124 China [email protected] +86 10 67392733.
² School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing Beijing 10083 China.

Abstract

In this work, a paraelectric complex perovskite Ba(Zn_1/3Nb_2/3)O₃ (BZN) was introduced into the morphotropic boundary composition (Bi_0.5Na_0.5)_0.93Ba_0.07TiO₃ (BNBT) to modulate the phase structure and electrical properties as well as the field-induced strain behavior. Using a columbite route, the ceramics with pure perovskite structure were successfully fabricated. The structure and electrical measurements showed that the introduction of BZN into BNBT results in the decrease of the rhombohedrality 90-γ, and promotes the evolution from ferroelectric to antiferroelectric (AFE) relaxor. Besides, the introduction of BZN induces the volume increase and dimension reduction of the nanosized AFE relaxor domains. A large field-induced strain of 0.39% with good stability against frequency, field, and temperature was obtained at the BNZ addition of composition x = 0.01, which locates at the critical composition boundary between ferroelectric state and AFE relaxor state.