The effect of Fe-acceptor doping on the electrical properties of Na1/2Bi1/2TiO3 and 0.94 (Na1/2Bi1/2 )TiO3–0.06 BaTiO3

Sebastian Steiner, In Tae Seo, Pengrong Ren, Ming Li, David J. Keeble, Till Frömling (Lead / Corresponding author)

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Na1/2Bi1/2TiO3 (NBT) based ceramics are amongst the most promising lead-free ferroelectric materials. It was expected that the defect chemistry and the effect of doping of NBT would be similar to that observed for lead based materials, however, acceptor doping does not lead to ferroelectric hardening. Instead, high oxygen ionic conductivity is induced. Nevertheless, for solid solutions with BaTiO3 (BT), which are more relevant with respect to ferroelectric applications, such a drastic change of electrical properties has not been observed so far. To rationalize the difference in defect chemistry between NBT and its solid solution 94(Na1/2Bi1/2TiO3 )–0.06 BaTiO3 (NBT–6BT) compositions with different concentrations of Fe-dopant were investigated. The study illustrates that the materials exhibit very similar behavior to NBT, and extraordinarily high oxygen ionic conductivity could also be induced in NBT–6BT. The key difference between NBT–6BT and NBT is the range of the dependence of ionic conductivity with dopant concentration. Previous studies of NBT–6BT have not reached sufficiently high dopant concentrations to observe high conductivity. In consequence, the same defect chemical model can be applied to both NBT and its solid solutions. This will help to rationalize the effect of doping on ferroelectric properties of NBT-ceramics and defect chemistry related degradation and fatigue.

Original languageEnglish
Pages (from-to)5295-5304
Number of pages10
JournalJournal of the American Ceramic Society
Volume102
Issue number9
DOIs
Publication statusPublished - 22 Feb 2019

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Electric properties
Doping (additives)
Ferroelectric materials
Ionic conductivity
Solid solutions
Defects
Lead
Oxygen
Hardening
Fatigue of materials
Degradation
Chemical analysis

Keywords

  • BNT
  • conductivity
  • defects
  • ferroelectricity/ferroelectric materials
  • ionic conductivity

Cite this

Steiner, Sebastian ; Seo, In Tae ; Ren, Pengrong ; Li, Ming ; Keeble, David J. ; Frömling, Till. / The effect of Fe-acceptor doping on the electrical properties of Na1/2Bi1/2TiO3 and 0.94 (Na1/2Bi1/2 )TiO3–0.06 BaTiO3. In: Journal of the American Ceramic Society. 2019 ; Vol. 102, No. 9. pp. 5295-5304.
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The effect of Fe-acceptor doping on the electrical properties of Na1/2Bi1/2TiO3 and 0.94 (Na1/2Bi1/2 )TiO3–0.06 BaTiO3. / Steiner, Sebastian; Seo, In Tae; Ren, Pengrong; Li, Ming; Keeble, David J.; Frömling, Till (Lead / Corresponding author).

In: Journal of the American Ceramic Society, Vol. 102, No. 9, 22.02.2019, p. 5295-5304.

Research output: Contribution to journalArticle

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AU - Steiner, Sebastian

AU - Seo, In Tae

AU - Ren, Pengrong

AU - Li, Ming

AU - Keeble, David J.

AU - Frömling, Till

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AB - Na1/2Bi1/2TiO3 (NBT) based ceramics are amongst the most promising lead-free ferroelectric materials. It was expected that the defect chemistry and the effect of doping of NBT would be similar to that observed for lead based materials, however, acceptor doping does not lead to ferroelectric hardening. Instead, high oxygen ionic conductivity is induced. Nevertheless, for solid solutions with BaTiO3 (BT), which are more relevant with respect to ferroelectric applications, such a drastic change of electrical properties has not been observed so far. To rationalize the difference in defect chemistry between NBT and its solid solution 94(Na1/2Bi1/2TiO3 )–0.06 BaTiO3 (NBT–6BT) compositions with different concentrations of Fe-dopant were investigated. The study illustrates that the materials exhibit very similar behavior to NBT, and extraordinarily high oxygen ionic conductivity could also be induced in NBT–6BT. The key difference between NBT–6BT and NBT is the range of the dependence of ionic conductivity with dopant concentration. Previous studies of NBT–6BT have not reached sufficiently high dopant concentrations to observe high conductivity. In consequence, the same defect chemical model can be applied to both NBT and its solid solutions. This will help to rationalize the effect of doping on ferroelectric properties of NBT-ceramics and defect chemistry related degradation and fatigue.

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