文献类型：期刊文献

英文题名：Impedance behaviors of Nd-doped BiFeO3 ceramics with 0.10 ≤ x ≤ 0.30

作者：Zhou, Yi[1,2];Huang, Xiaohua[1,2];Jiang, Lei[1,2];Hou, Ying[3];Lin, Hongyi[1,2];Cheng, Zaijun[1,2];Sun, Dong[1,2]

机构：[1]Xiamen Univ Technol, Sch Optoelect & Commun Engn, Xiamen 361024, Peoples R China;[2]Fujian Key Lab Optoelect Technol & Devices, Xiamen 361024, Peoples R China;[3]East China Univ Sci & Technol, Sch Phys, Shanghai 200237, Peoples R China

年份：2022

卷号：33

期号：33

起止页码：25475

外文期刊名：JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS

收录：;EI(收录号：20224312992269);WOS:【SCI-EXPANDED(收录号:WOS:000874049900002)】；

基金：This work was supported by the National Natural Science Foundation of China [Grant numbers 11904304 and 91963116], Natural Science Foundation of Fujian Province [Grant numbers 2021J011218, 2021J011217, 2021J011215 and 2021I0025].

语种：英文

外文关键词：Activation energy - Iron compounds - Neodymium compounds - Relaxation processes - Solid state reactions

摘要：The Bi1-xNdxFeO3 (BNFO) ceramics with 0.10 <= x <= 0.30 were fabricated by the solid-state reaction method. As Nd concentration x increases, the samples experience a structural phase transition from R3c phase to Pnma phase with the intermediate phase Pna2(1). The systematical study on the impedance spectra that are plotted with various formalisms reveals that the grain effect dominates the single non-Debye thermally activated relaxation process, and an equivalent parallel circuit with RC element and constant phase element can interpret the impedance Nyquist plots for all the samples with a good fitting result. The frequency-dependent normalized impedance and modulus spectra and the ac conductivity analysis suggest the primary role of the localized conductivity in the BNFO system, which may be possibly assisted by small polarons and affected by the structural phase transition in the sample. According to the estimated values of activation energy E-a derived from temperature-dependent dc conductivity data, it is speculated that the doubly ionized oxygen vacancies combined with ferroelectric interactions may be responsible for the short-range movements in the conductivity and relaxation process.