Spontaneous ferroelectric order in lead-free relaxor N a1/2 B i1/2Ti O3 -based composites

Lalitha K. V., Manuel Hinterstein, Kai Yang Lee, Tiannan Yang, Long Qing Chen, Pedro B. Groszewicz, Jurij Koruza, Jürgen Rödel

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Short-range ordered polar nanoregions are key to the giant electromechanical properties exhibited by relaxor ferroelectrics. Stabilization of the long-range ferroelectric order in relaxor systems has typically been achieved by applying external fields. In this work, spontaneous (zero-field) ferroelectric order is demonstrated in the composites constituting of nonergodic relaxor matrix phase 0.91Na1/2Bi1/2TiO3-0.09BaTiO3 with ZnO inclusions. Direct structural evidence is provided for the long-range ferroelectric order in the composites using in situ electric-field-dependent synchrotron investigations and Na23 nuclear magnetic resonance spectroscopy. Thermodynamic analysis incorporating microelasticity reveals the role of spatial residual stress in stabilizing the ferroelectric order. The work provides a direct correlation between the stabilized ferroelectric order and enhanced thermal stability, which can be utilized to guide the design of spontaneous long-range order in other relaxor systems.

Original languageEnglish (US)
Article number174108
JournalPhysical Review B
Volume101
Issue number17
DOIs
StatePublished - May 1 2020

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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