Detecting depinning of polar nanoregions under dc external electric field in canonical relaxor ferroelectric Pb(Mg1/3Ta2/3)O3 via acoustic emission. Issue 10 (16th June 2016)

• Record Type: Journal Article
• Authors: Dul'kin, Evgeniy; Kania, Antoni; Roth, Michael
• Is Part Of: Physica status solidi. Volume 253:Issue 10(2016)
• Page Start: 1937
• Page End: 1940
• Publication Date: 2016-06-16
• Subjects: acoustic emission -- depinning field -- ferroelectrics -- Pb(Mg1/3Ta2/3)O3 -- polar nanoregions; Solid state physics -- Periodicals; Solids -- Periodicals; Atomic structure -- Periodicals; 530.41
• DOI: 10.1002/pssb.201600145
• Languages: English
• ISSNs: 0370-1972

Abstract

Abstract : Canonical relaxor ferroelectric Pb(Mg1/3 Ta2/3 )O3 single crystals were studied via acoustic emission in temperature range of 180–250 K covering their dielectric constant temperature maximum at T m ≈ 202 K, and under dc external electric fields up to 1.2 kV cm −1 . The dependence of T m on dc external electric field exhibits a nonlinear behavior, characteristic of relaxors: it initially decreases, attains a sharp minimum at the threshold field of 0.25 kV cm −1 and then starts to increase, as the field enhances. The count rate of the accompanying acoustic emission exhibits two maxima: at 0.1 and 0.6 kV cm −1 . The latter obviously corresponds to the end critical point, also characteristic of relaxors, while the former is attributed to a polar nanoregions depinning field at which the polar nanoregions start to be switched off from the intrinsic random electric fields to the dc external electric field. These data are discussed from the viewpoint of competition between random electric fields and an external electric field when affecting the polar nanoregions.