Large strain of lead-free bismuth ferrite ternary ceramics at elevated temperature

SCRIPTA MATERIALIA

卷:155

Article

Zheng, Ting¹  Zhao, Chunlin¹  Wu, Jiagang¹  Wang, Ke²  Li, Jing-Feng² 

[1] Sichuan Univ, Dept Mat Sci, Chengdu 610064, Sichuan, Peoples R China

[2] Tsinghua Univ, State Key Lab New Ceram & Fine Proc, Sch Mat Sci & Engn, Beijing 100084, Peoples R China

关键词: BiFeO3-BaTiO3;    Ternary system;    Strain property;    Temperature dependence;   

DOI  :  10.1016/j.scriptamat.2018.06.007

来源: Elsevier

【 摘 要 】

Here we observed a large strain of lead-free BiFeO3 ternary ceramics by the composition design [(0.70-x) Bi1.05FeO3-0.30BaTiO(3)-xBi(Mg2/3Nb1/3)O-3]. Positive temperature dependence of strain under E = 4 kV/mm can be observed in the ceramics with x = 0.07. Large strain property (S = 032% and d(33)* = 800 pm/V) and low hysteresis (H = 5%) can be achieved in the ceramics measured at 200 degrees C, which may originate from thermally activated domain switching, electric field-induced relaxor to ferroelectric phase transition, and intrinsic lattice strain. We believe that the lead-free bismuth ferrite ternary ceramics with both large strain properties and small hysteresis are promising for high-temperature actuator applications. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

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