Sub-lattice polarization states in anti-ferroelectrics and their relaxation process

Melvin Vopson, Xiaoli Tan, Esmaeil Namvar, Michal Belusky, Stephen Thompson, Victor Kuncser, Fernando Plazaola, Iraultza Unzueta , Chiu Tang

Research output: Contribution to journalArticlepeer-review

55 Downloads (Pure)

Abstract

We report studies of quasi-remanent polarization states in Pb0.99Nb0.02 [(Zr0.57Sn0.43) 0.94Ti0.06] 0.98O3 (PNZST) anti-ferroelectric ceramics and investigation of their relaxation effects using unique insitu electrically activated time-resolved Synchrotron X-ray powder diffraction (SXPD) and 119Sn Mössbauer Spectroscopy (MS). The SXPD patterns are consistent with a phase transition from quasi-tetragonal perovskite in 0V relaxed anti-ferroelectric state to rhombohedral distortion in ferroelectric state under saturating applied voltages of 2kV. The observed quasi-remanent polarization relaxation processes are due to the fact that tetragonal to rhombohedral distortion does not occur at the applied voltage required to access the quasi-remanent polarization states, and the tetragonal symmetry restored after the removal of the applied electric field is preserved. Since these quasi-remanent polarization states were seen as possibly suitable for memory applications, the implications of this study are that anti-ferroelectrics are more feasible for multi-state dynamic random access memories (DRAM), while their application to non-volatile memories requires development of more sophisticated "read-out" protocols, possibly involving dc electrical biasing.
Original languageEnglish
Pages (from-to)651-656
Number of pages6
JournalCurrent Applied Physics
Volume19
Issue number5
Early online date15 Mar 2019
DOIs
Publication statusPublished - 1 May 2019

Keywords

  • polarization relaxation
  • anti-polar materials
  • solid state memories
  • time resolved synchrotron measurements
  • Mossbauer spectroscopy
  • RCUK
  • EPSRC
  • EP/R028656/1

Fingerprint

Dive into the research topics of 'Sub-lattice polarization states in anti-ferroelectrics and their relaxation process'. Together they form a unique fingerprint.
  • Iowa State University

    Melvin Vopson (Visiting researcher)

    5 Nov 201815 Nov 2018

    Activity: Visiting an external organisation typesVisiting an external academic institution

  • Diamond Light Source

    Melvin Vopson (Visiting researcher)

    3 Jul 20186 Jul 2018

    Activity: Visiting an external organisation typesVisiting an external academic institution

Cite this