On the question of the critical end point in the (1 - X)PbMg1/3Nb2/3O3-xPbTiO3relaxor ferroelectric single crystals based on acoustic emission data studies

Evgeniy Dul'Kin, Antoni Kania, Michael Roth

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Abstract

- (1 - x)PbMg1/3Nb2/3O3-xPbTiO3, [100]-oriented relaxor ferroelectric crystals were studied by means of dielectric and acoustic emission methods in a temperature range up to 200 °C and under a dc bias electric field up to 1.2 kV/cm. The monoclinic-tetragonal and tetragonal-cubic ferroelectric phase transitions were successfully detected by both experimental methods. The bias electric field dependence of the temperature of a dielectric constant maximum, related to tetragonal-cubic phase transitions, exhibits a V-shape effect with a threshold field of 0.5 kV/cm. In contrast, the bias electric field dependence of the temperature of a monoclinic-tetragonal phase transition exhibits no V-shape effect but points out a tricritical point at 0.7 kV/cm. These results have not confirmed the existence of the critical end point in the crystals under studies.

Original languageAmerican English
Article number67001
JournalLettere Al Nuovo Cimento
Volume133
Issue number6
DOIs
StatePublished - Feb 2021

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