Temperature dependent polarization reversal mechanism in 0.94(Bi1/2Na1/2) TiO3-0.06Ba(Zr0.02Ti0.98)O3 relaxor ceramics

Julia Glaum, Hugh Simons, Jessica Hudspeth, Matias Acosta, John E. Daniels

Research output: Contribution to journalJournal articleResearchpeer-review

625 Downloads (Pure)

Abstract

The temperature at which the electric field induced long-range ordered ferroelectric state undergoes transition into the short-range ordered relaxor state, TF-R, is commonly defined by the onset of strong dispersion of the dielectric permittivity. However, this combined macroscopic property and structural investigation of the polarization reversal process in the prototypical lead-free relaxor 0.94(Bi1/2Na1/2)TiO3-0.06Ba(Zr0.02Ti0.98)O3 reveals that an applied electric field can trigger depolarization and onset of relaxor-like behavior well below TF-R. The polarization reversal process can as such be described as a combination of (1) ferroelectric domain switching and (2) a reversible phase transition between two polar ferroelectric states mediated by a non-polar relaxor state. Furthermore, the threshold fields of the second, mediated polarization reversal mechanism depend strongly on temperature. These results are concomitant with a continuous ferroelectric to relaxortransition occurring over a broad temperature range, during which mixed behavior is observed. The nature of polarization reversal can be illustrated in electric-field-temperature (E-T) diagrams showing the electric field amplitudes associated with different polarization reversal processes. Such diagrams are useful tools for identifying the best operational temperature regimes for a given composition in actuator applications.
Original languageEnglish
Article number232906
JournalApplied Physics Letters
Volume107
Issue number23
Number of pages5
ISSN0003-6951
DOIs
Publication statusPublished - 2015

Bibliographical note

© 2015 AIP Publishing LLC

Fingerprint

Dive into the research topics of 'Temperature dependent polarization reversal mechanism in 0.94(Bi<sub>1/2</sub>Na<sub>1/2</sub>) TiO<sub>3</sub>-0.06Ba(Zr<sub>0.02</sub>Ti<sub>0.98</sub>)O<sub>3</sub> relaxor ceramics'. Together they form a unique fingerprint.

Cite this