Regular Article

Comparison of random field strengths in (1-x)SrTiO₃-xBiFeO₃ and (1-x)SrTiO₃-xBaTiO₃ relaxor ferroelectrics by means of acoustic emission

Department of Applied Physics, The Hebrew University of Jerusalem, Jerusalem 91904, Israel

^* e-mail: evgeniy.dulkin@mail.huji.ac.il

Received: 21 March 2020
Received in final form: 2 September 2020
Accepted: 2 October 2020
Published online: 13 November 2020

Abstract

In relaxor (1-x)SrTiO₃-xBiFeO₃ ferroelectrics ceramics (x = 0.2, 0.3 and 0.4) both intermediate temperatures and Burns temperatures were successfully detected and their behavior were investigated in dependence on an external bias field using an acoustic emission. All these temperatures exhibit a non-trivial behavior, i.e. attain the minima at some threshold fields as a bias field enhances. It is established that the threshold fields decrease as x increases in (1-x)SrTiO₃-xBiFeO₃, as it previously observed in (1-x)SrTiO₃-xBaTiO₃ (E. Dul'kin, J. Zhai, M. Roth, Phys. Status Solidi B 252, 2079 (2015)). Based on the data of the threshold fields the mechanisms of arising of random electric fields are discussed and their strengths are compared in both these relaxor ferroelectrics.