Insight into the Ultrahigh Electric Performance of Aurivillius CBTa-CBN Solid Solution

Ning Chen; Fei Wang; Xu Li; Xinji Yang; Hao Chen; Zhi Tan; Jie Xing; Jianguo Zhu

doi:10.1021/acs.inorgchem.3c00244

Insight into the Ultrahigh Electric Performance of Aurivillius CBTa-CBN Solid Solution

Inorg Chem. 2023 May 8;62(18):6993-7002. doi: 10.1021/acs.inorgchem.3c00244. Epub 2023 Apr 21.

Authors

Ning Chen¹, Fei Wang², Xu Li¹, Xinji Yang¹, Hao Chen¹, Zhi Tan¹, Jie Xing¹, Jianguo Zhu¹

Affiliations

¹ College of Materials Science and Engineering, Sichuan University, 610064 Chengdu, China.
² College of Materials Science and Engineering, Chongqing University of Technology, 400054 Chongqing, China.

PMID: 37083419
DOI: 10.1021/acs.inorgchem.3c00244

Abstract

For bismuth layered structural ferroelectrics (BLSFs), CaBi₂Ta₂O₉ (CBTa) demonstrates valuable application potential for a high Curie temperature (T_C) of 923 °C and a good high-temperature resistivity, but low piezoelectric constant d₃₃ values. Compared with CBTa-based ceramics, CaBi₂Nb₂O₉ (CBN) with a high T_C of 940 °C is easy to modify and realize excellent enhancement of piezoelectric properties. Here, by introducing a CBN-based component into CBTa, a new type of solid-solution ceramic with the formula Ca_0.94(LiCe)_0.03Bi₂Ta₂O₉-xCa_0.94(LiCe)_0.03Bi₂Nb₂O₉ (LC-CBTa-xCBN) is fabricated to obtain the advantages of both of them. Moreover, optimal electrical performances are obtained in the LC-CBTa-0.4CBN ceramic (d₃₃ ∼ 14.1 pC/N, ρ ∼ 1.08 × 10⁶ at 600 °C, T_C ∼ 940 °C). The correlated characterizations, including structure and electricity, provide further realization of an enhanced performance mechanism. Therefore, this method of constructing a new type of solid solution provides a new strategy to modify BLSFs.