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Temperature-dependent volume fraction of polar nanoregions in lead-free (1 − x)(Bi0.5Na0.5)TiO3-xBaTiO3 ceramics

Vögler, Malte and Novak, Nikola and Schader, Florian H. and Rödel, Jürgen (2017):
Temperature-dependent volume fraction of polar nanoregions in lead-free (1 − x)(Bi0.5Na0.5)TiO3-xBaTiO3 ceramics.
In: Physical Review B, American Physical Society, 95, ISSN 1098-0121, [Article]

Abstract

The formation and temperature evolution of polar nanoregions (PNRs) in relaxor ferroelectrics is an intriguing issue that is still under debate. Therefore, we present an approach to estimate the volume fraction of PNRs by the example of the relaxor ferroelectric, (1 − x)(Bi0.5Na0.5)TiO3-xBaTiO3 (BNT-xBT). A detailed analysis of the Young’s modulus, which is highly sensitive to small structural distortions, at temperatures 25 ◦C< T <800 ◦C for both poled and unpoled samples, is correlated to the temperature evolution of PNRs by utilizing a composite model. The extracted volume fraction of the PNRs and the increasing Young’s modulus above the formerly suggested Burns temperature indicate that the formation of the PNRs does not occur at a defined temperature but rather in a broad temperature range starting around ∼720 ◦C.

Item Type: Article
Erschienen: 2017
Creators: Vögler, Malte and Novak, Nikola and Schader, Florian H. and Rödel, Jürgen
Title: Temperature-dependent volume fraction of polar nanoregions in lead-free (1 − x)(Bi0.5Na0.5)TiO3-xBaTiO3 ceramics
Language: English
Abstract:

The formation and temperature evolution of polar nanoregions (PNRs) in relaxor ferroelectrics is an intriguing issue that is still under debate. Therefore, we present an approach to estimate the volume fraction of PNRs by the example of the relaxor ferroelectric, (1 − x)(Bi0.5Na0.5)TiO3-xBaTiO3 (BNT-xBT). A detailed analysis of the Young’s modulus, which is highly sensitive to small structural distortions, at temperatures 25 ◦C< T <800 ◦C for both poled and unpoled samples, is correlated to the temperature evolution of PNRs by utilizing a composite model. The extracted volume fraction of the PNRs and the increasing Young’s modulus above the formerly suggested Burns temperature indicate that the formation of the PNRs does not occur at a defined temperature but rather in a broad temperature range starting around ∼720 ◦C.

Journal or Publication Title: Physical Review B
Volume: 95
Publisher: American Physical Society
Divisions: 11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
11 Department of Materials and Earth Sciences
Date Deposited: 06 Jan 2017 07:39
Identification Number: doi:10.1103/PhysRevB.95.024104
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