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Ionics

, Volume 25, Issue 6, pp 2729–2734 | Cite as

Ionic conductive and dielectric properties of samarium isovalent doping in non-stoichiometric bismuth sodium titanate perovskite

  • Xiao Liu
  • Yunxia Zhao
  • Huicong Hu
  • Huiling Du
  • Jing ShiEmail author
Original Paper
  • 65 Downloads

Abstract

Oxide ion-conducting solid electrolytes are of considerable importance as fuel cell component. Recently, Bi0.5Na0.5TiO3 (BNT)-based perovskite-structured oxides become a new hotspot of solid electrolyte since it has potential in oxygen ion conduction. Considerable ionic conductivity is achieved in a Bi deficient or an acceptor doping composition. In this work, the role of Sm content without lone pair electrons substituted for isovalent Bi is studied on the electrical properties of non-stoichiometric (Bi0.45Ca0.04)Na0.5TiO2.965 (BCNT). In the solid solution range, a transformation from resistive BCNT to dominated oxide ionic conductive process is revealed despite no additional designed vacancies involved. Interestingly, employment of smaller Sm cations by doping favors the plateau formation of dielectric permittivity at higher frequencies. Lone pairs substitution conception and shrinkage of lattice parameters are proposed to be responsible for the anomalous dielectric relaxation.

Keywords

Lead free Bismuth sodium titanate Oxide ion conductors Dielectrics 

Notes

Funding information

This work was supported by the National Natural Science Foundation (51702249, 51602252, 51372197), the China Postdoctoral Science Foundation (2017M613065), the Shaanxi Province Science Foundation (2017JQ5072), and the Outstanding Youth Science Fund of Xi’an University of Science and Technology (2018YQ2-11).

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Xiao Liu
    • 1
  • Yunxia Zhao
    • 1
  • Huicong Hu
    • 1
  • Huiling Du
    • 1
  • Jing Shi
    • 2
    Email author
  1. 1.School of Materials Science and EngineeringXi’an University of Science and TechnologyXi’anChina
  2. 2.Key Laboratory of Electronic Equipment Structure Design (Ministry of Education), School of Electro-Mechanical EngineeringXidian UniversityXi’anChina

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