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Spontaneous ferroelectric order in lead-free relaxor Na1/2Bi1/2TiO3-based composites

Kodumudi Venkataraman, Lalitha and Hinterstein, Manuel and Lee, Kai-Yang and Yang, Tiannan and Chen, Long-Qing and Groszewicz, Pedro B. and Koruza, Jurij and Rödel, Jürgen (2020):
Spontaneous ferroelectric order in lead-free relaxor Na1/2Bi1/2TiO3-based composites.
In: Physical Review B, (101), American Physical Society, p. 174108, ISSN 1098-0121,
DOI: 10.1103/PhysRevB.101.174108,
[Article]

Abstract

Short-range ordered polar nanoregions are key to the giant electromechanical properties exhibited by relaxorferroelectrics. Stabilization of the long-range ferroelectric order in relaxor systems has typically been achievedby applying external fields. In this work, spontaneous (zero-field) ferroelectric order is demonstrated inthe composites constituting of nonergodic relaxor matrix phase 0.91Na1/2Bi1/2TiO3-0.09BaTiO3with ZnOinclusions. Direct structural evidence is provided for the long-range ferroelectric order in the composites usingin situelectric-field-dependent synchrotron investigations and23Na nuclear magnetic resonance spectroscopy.Thermodynamic analysis incorporating microelasticity reveals the role of spatial residual stress in stabilizingthe ferroelectric order. The work provides a direct correlation between the stabilized ferroelectric order andenhanced thermal stability, which can be utilized to guide the design of spontaneous long-range order in otherrelaxor systems.

Item Type: Article
Erschienen: 2020
Creators: Kodumudi Venkataraman, Lalitha and Hinterstein, Manuel and Lee, Kai-Yang and Yang, Tiannan and Chen, Long-Qing and Groszewicz, Pedro B. and Koruza, Jurij and Rödel, Jürgen
Title: Spontaneous ferroelectric order in lead-free relaxor Na1/2Bi1/2TiO3-based composites
Language: English
Abstract:

Short-range ordered polar nanoregions are key to the giant electromechanical properties exhibited by relaxorferroelectrics. Stabilization of the long-range ferroelectric order in relaxor systems has typically been achievedby applying external fields. In this work, spontaneous (zero-field) ferroelectric order is demonstrated inthe composites constituting of nonergodic relaxor matrix phase 0.91Na1/2Bi1/2TiO3-0.09BaTiO3with ZnOinclusions. Direct structural evidence is provided for the long-range ferroelectric order in the composites usingin situelectric-field-dependent synchrotron investigations and23Na nuclear magnetic resonance spectroscopy.Thermodynamic analysis incorporating microelasticity reveals the role of spatial residual stress in stabilizingthe ferroelectric order. The work provides a direct correlation between the stabilized ferroelectric order andenhanced thermal stability, which can be utilized to guide the design of spontaneous long-range order in otherrelaxor systems.

Journal or Publication Title: Physical Review B
Number: 101
Publisher: American Physical Society
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
Date Deposited: 19 May 2020 06:22
DOI: 10.1103/PhysRevB.101.174108
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