Electric-field-induced phase transformation and frequency-dependent behavior of bismuth sodium titanate-barium titanate

Kai Yang Lee, Xi Shi, Nitish Kumar, Mark Hoffman, Martin Etter, Stefano Checchia, Jens Winter, Lucas Lemos da Silva, Daniela Seifert, Manuel Hinterstein

Research output: Contribution to journalArticlepeer-review

7 Citations (SciVal)

Abstract

The electric field response of the lead-free solid solution (1-x)Bi0.53Na0.47TiO3-xBaTiO3 (BNT-BT) in the higher BT composition range with x = 0.12 was investigated using in situ synchrotron X-ray powder diffraction. An introduced Bi-excess non-stoichiometry caused an extended morphotropic phase boundary, leading to an unexpected fully reversible relaxor to ferroelectric (R-FE) phase transformation behavior. By varying the field frequency in a broad range from 10-4 up to 102 Hz, BNT-12BT showed a frequency-dependent gradual suppression of the field induced ferroelectric phase transformation in favor of the relaxor state. Afrequency triggered self-heating within the sample was found and the temperature increase exponentially correlated with the field frequency. The effects of a lowered phase transformation temperature TR-FE, caused by the non-stoichiometric composition, were observed in the experimental setup of the freestanding sample. This frequency-dependent investigation of an R-FE phase transformation is unlike previous macroscopic studies, in which heat dissipating metal contacts are used.

Original languageEnglish
Article number1054
JournalMaterials
Volume13
Issue number5
DOIs
Publication statusPublished - 2020 Feb 27

Subject classification (UKÄ)

  • Metallurgy and Metallic Materials
  • Materials Chemistry

Keywords

  • Actuating materials
  • BNT-BT
  • Ferroelectrics
  • Lead-free
  • Phase transformation
  • Piezoceramics
  • Piezoelectricity
  • Relaxor
  • Self-heating
  • X-ray powder diffraction

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