Acoustic emission study of PZN-7%PT crystals

Evgeniy Dul'Kin*, Evgeny Mojaev, Michael Roth, Pierre Eymeric Janolin, Brahim Dkhil

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

11 Scopus citations


Phase transitions in PbZn1/3Nb2/3O 3-7%PbTiO3 (PZN-7%PT) relaxor ferroelectric crystals have been investigated by the acoustic emission (AE) method. Two types of transitions have been detected: (i) associated with the thermally induced (on cooling) formation of intrinsic polar nanoregions (PNRs) and (ii) related to the electric-field-induced macroscopic phase transitions. An AE signal found near 740 K corresponds to the Burns temperature, below which the PNRs begin to form. Further cooling reveals an AE signal at 500 K, which is ascribed to the shift of PNRs along their polar direction relative to the surrounding non-polar matrix in the framework of the "phase-shifted condensed soft mode" model. Monitoring of the AE response of PZN-7%PT crystals under an increasing [001] dc electric field has allowed a unique in situ observation of a sequence of phase transitions, from the zero-field rhombohedral via MA monoclinic (∼3 kV/cm) and MC monoclinic (∼16 kV/cm) to the tetragonal (∼19 kV/cm) phase, respectively. It is shown that AE is a very sensitive method for detecting both the PNRs kinetics and low distortion phase transitions in relaxor ferroelectrics.

Original languageAmerican English
Pages (from-to)131-137
Number of pages7
Issue number1 PART 1
StatePublished - 2007
Event8th European Conference on Applications of Polar Dielectrics, ECAPD'8 - Metz, France
Duration: 5 Sep 20068 Sep 2006


  • Acoustic emission
  • Burns temperature
  • Phase transition
  • Rlaxor ferroelectrics


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