Study on electrical conductivity and oxygen migration of the oxide-ion conductors \(\hbox {Na}_{0.5}\hbox {Bi}_{0.5}\hbox {Ti}_{1-x}\hbox {Mg}_{{x}}\hbox {O}_{3-x}\)

  • W G WangEmail author
  • X Y Li
  • T Liu
  • G L Hao


Electrical performance and oxygen relaxation behaviour in \(\hbox {Na}_{0.5}\hbox {Bi}_{0.5}\hbox {Ti}_{1-x}\hbox {Mg}_{{x}}\hbox {O}_{3-x }\) compounds were investigated. The oxide ion conductivity of \(\hbox {Na}_{0.5}\hbox {Bi}_{0.5}\hbox {Ti}_{1-x}\hbox {Mg}_{{x}}\hbox {O}_{3-x }\) compounds increased first and then decreased with increasing Mg-doped content. The highest oxide ion conductivity of \(4.7\times 10^{-3}\) S \(\hbox {cm}^{-1}\) at 773 K was observed for the \(\hbox {Na}_{0.5}\hbox {Bi}_{0.5}\hbox {Ti}_{0.96}\hbox {Mg}_{0.04}\hbox {O}_{2.96}\) compound. A typical relaxation peak in the \(\hbox {Na}_{0.5}\hbox {Bi}_{0.5}\hbox {Ti}_{1-x}\hbox {Mg}_{{x}}\hbox {O}_{3-x}\) samples was observed. The activation energy and pre-exponential factors were determined as (\(1.0~\hbox {eV}, 4.7\times 10^{-16}\) s) and (\(0.94{-}1.0~\hbox {eV}, 6.8\times 10^{-14}{-}3.1\times 10^{-13}\) s) from internal friction and dielectric relaxation measurement, respectively. The lower oxide ion conductivity in \(\hbox {Na}_{0.5}\hbox {Bi}_{0.5}\hbox {Ti}_{1-x}\hbox {Mg}_{{x}}\hbox {O}_{3-x}\) (\(x=0.06\), 0.08, 0.10) compounds may arise from the lower vacancy mobility. Judging from the electrical performance and relaxation parameters, although lower-level Mg-doping can improve oxide ionic conductor, oxygen vacancy mobility in \(\hbox {Na}_{0.5}\hbox {Bi}_{0.5}\hbox {Ti}_{1-x}\hbox {Mg}_{{x}}\hbox {O}_{3-x }\) compounds cannot be improved with increasing Mg-doping content. These results will be meaningful to ameliorate the electrical properties of \(\hbox {Na}_{0.5}\hbox {Bi}_{0.5}\hbox {Ti}_{1-x}\hbox {Mg}_{{x}}\hbox {O}_{3-x}\) compounds and understand the relationship between the electrical properties and structure.


Dielectric relaxation internal friction oxide ionic conductivity enhanced factors oxygen vacancy mobility 



This work has been subsidized by the National Natural Science Foundation of China (nos. 11604286, 51661032), the Shaanxi Provincial Natural Science Foundation (no. 15JK1833), Special project of Yan’an University Institute of Material Physics Research and High-level University Construction Special Program of Shaanxi Province (no. Physics-2012SXTS05), the Yan’an University National Natural Science Foundation (nos. YD2015-07, YDBK2014-01) and by the Shanxi Provincial College students’ innovative projects (nos. D2017143, D2017163).


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© Indian Academy of Sciences 2019

Authors and Affiliations

  1. 1.College of Physics and Electronic InformationYan’an UniversityYan’anPeople’s Republic of China

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