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

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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.

Detaljer

Författare
  • Kai Yang Lee
  • Xi Shi
  • Nitish Kumar
  • Mark Hoffman
  • Martin Etter
  • Stefano Checchia
  • Jens Winter
  • Lucas Lemos da Silva
  • Daniela Seifert
  • Manuel Hinterstein
Enheter & grupper
Externa organisationer
  • Karlsruhe Institute of Technology
  • University of New South Wales
  • German Electron Synchrotron (DESY)
  • European Synchrotron Radiation Facility
  • University of Siegen
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Metallurgi och metalliska material
  • Materialkemi

Nyckelord

Originalspråkengelska
Artikelnummer1054
TidskriftMaterials
Volym13
Utgåva nummer5
StatusPublished - 2020 feb 27
PublikationskategoriForskning
Peer review utfördJa