Electric field dependence of characteristic temperatures in PbSc 0.5Ta0.5O3 and Pb0.78Ba 0.22Sc0.5Ta0.5O3 relaxors studied via acoustic emission

E. Dul'kin*, B. Mihailova, M. Gospodinov, M. Roth

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Abstract

Two model relaxor ferroelectrics PbSc0.5Ta0.5O 3 (undergoing a spontaneous para-to-ferroelectric phase transformation) and Pb0.78Ba0.22Sc0.5Ta 0.5O3 (no long-range ferroelectric order in the absence of an external electric field) were studied by acoustic emission in the temperature range 200-600 K under a dc field E. Both compounds exhibit a para-to-antiferroelectric transformation at Tn, which is slightly above the temperature of the dielectric-permittivity maximum. For both compounds the intermediate temperature T* increases linearly with increasing E. The dT*/dE slope is larger than that of the ferroelectric transformation temperature Tc, similar to the transformation phenomena in BaTiO3. The T*(E) increase is suggested to be due to enhanced dipole polarizations inside the polar nanoregions.

Original languageAmerican English
Article number57002
JournalLettere Al Nuovo Cimento
Volume94
Issue number5
DOIs
StatePublished - Jun 2011

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