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所属单位：Shandong University

发表刊物：Journal of the American Ceramic Society

关键字：Bismuth layer-structured ferroelectric calcium bismuth niobate (CaBi2Nb2O9, CBN) is considered to be one of the most potential high-temperature piezoelectric materials due to its high Curie temperature T-c of similar to 940 degrees C, but the drawbacks of low electrical resistivity at elevated temperature and low piezoelectric performance limit its applications as key electronic components at high temperature (HT). Herein, we report significantly enhanced dc electrical resistivity and piezoelectric properties of CBN ceramics through rare-earth element Tb ions compositional adjustment. The nominal compositions of Ca1-xTbxBi2Nb2O9 (abbreviated as CBN-100xTb) have been fabricated by conventional solid-state reaction method. The composition of CBN-3Tb exhibits a significantly enhanced dc electrical resistivity of 1.97 x 10(6) omega cm at 600 degrees C, which is larger by two orders of magnitude compared with unmodified CBN. The donor substitutions of Tb3+ ions for Ca2+ ions reduce the oxygen vacancy concentrations and increase the band-gap energy, which is responsible for the enhancement of dc electric resistivity. The temperature-dependent dc conduction properties reveal that the conduction is dominated by the thermally activated oxygen vacancies in the low-temperature region (200-350 degrees C) and by the intrinsic conduction in the HT region (350-650 degrees C). The CBN-3Tb also exhibits enhanced piezoelectric properties with a high piezoelectric coefficient d(33) of similar to 13.2 pC/N and a high T-c of similar to 966 degrees C. Moreover, the CBN-3Tb exhibits good thermal stabilities of piezoelectric properties, remaining 97% of its room temperature value after annealing at 900 degrees C. These properties demonstrate the great potentials of Tb-modified CBN for high-temperature piezoelectric applications.

摘要：Bismuth layer-structured ferroelectric calcium bismuth niobate (CaBi2Nb2O9, CBN) is considered to be one of the most potential high-temperature piezoelectric materials due to its high Curie temperature T-c of similar to 940 degrees C, but the drawbacks of low electrical resistivity at elevated temperature and low piezoelectric performance limit its applications as key electronic components at high temperature (HT). Herein, we report significantly enhanced dc electrical resistivity and piezoelectric properties of CBN ceramics through rare-earth element Tb ions compositional adjustment. The nominal compositions of Ca1-xTbxBi2Nb2O9 (abbreviated as CBN-100xTb) have been fabricated by conventional solid-state reaction method. The composition of CBN-3Tb exhibits a significantly enhanced dc electrical resistivity of 1.97 x 10(6) omega cm at 600 degrees C, which is larger by two orders of magnitude compared with unmodified CBN. The donor substitutions of Tb3+ ions for Ca2+ ions reduce the oxygen vacancy concentrations and increase the band-gap energy, which is responsible for the enhancement of dc electric resistivity. The temperature-dependent dc conduction properties reveal that the conduction is dominated by the thermally activated oxygen vacancies in the low-temperature region (200-350 degrees C) and by the intrinsic conduction in the HT region (350-650 degrees C). The CBN-3Tb also exhibits enhanced piezoelectric properties with a high piezoelectric coefficient d(33) of similar to 13.2 pC/N and a high T-c of similar to 966 degrees C. Moreover, the CBN-3Tb exhibits good thermal stabilities of piezoelectric properties, remaining 97% of its room temperature value after annealing at 900 degrees C. These properties demonstrate the great potentials of Tb-modified CBN for high-temperature piezoelectric applications.

全部作者：Qian Wang,Xian Zhao

第一作者：Juan-Nan Chen

论文类型：期刊论文

通讯作者：Chun-Ming Wang

学科门类：理学

一级学科：物理学

卷号：105

期号：7

页面范围：4815-4826

是否译文：否

发表时间：2022-07-01

收录刊物：SCI