On the question of the critical end point in the (1 − x)PbMg1/3Nb2/3O3-xPbTiO3 relaxor ferroelectric single crystals based on acoustic emission data studies. (11th May 2021)

• Record Type: Journal Article
• Authors: Dul'kin, Evgeniy; Kania, Antoni; Roth, Michael
• Is Part Of: Europhysics letters. Volume 133:Number 6(2021)
• Publication Date: 2021-05-11
• Subjects: 77.80.Jk -- 77.80.B- -- 43.40.Le; Physics -- Periodicals; Electronic journals; 530.05
• DOI: 10.1209/0295-5075/133/67001
• Languages: English
• ISSNs: 0295-5075

Abstract

Abstract: ( )PbMg Nb O PbTiO3, [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.