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Short crack fracture toughness in (1-x)(Na1/2Bi1/2) TiO3–xBaTiO3 relaxor ferroelectrics

Denkhaus, Sarah Marie and Vögler, Malte and Novak, Nikola and Rödel, Jürgen (2017):
Short crack fracture toughness in (1-x)(Na1/2Bi1/2) TiO3–xBaTiO3 relaxor ferroelectrics.
In: Journal of the American Ceramic Society, The American Ceramic Society, pp. 4760-4769, ISSN 00027820,
DOI: 10.1111/jace.15008,
[Article]

Abstract

The fracture toughness in the lead-free relaxor ferroelectric (1-x)(Na1/2Bi1/2) TiO3–xBaTiO3 was investigated utilizing the surface crack in flexure method. To allow a comprehensive assessment, unpoled, and poled samples from the rhombohedral, the tetragonal, and the morphotropic phase regime were considered. It was found that the fracture toughness is up to 23% higher for the poled state. In order to cover the transition from ferroelectric to relaxor phase, the temperature dependence of 0.97(Na1/2Bi1/2)TiO3–0.03BaTiO3 was studied as well. Fracture toughness values of up to 2 MPam1/2 were determined, which are considerably above data for lead zirconate titanate materials. The results are rationalized using a simple transformation toughening-type model in conjunction with investigations into the ferroelastic behavior. The presented model can be applied without fitting parameters but utilizes measurements of the coercive stress and remanent strain as well as the elastic modulus.

Item Type: Article
Erschienen: 2017
Creators: Denkhaus, Sarah Marie and Vögler, Malte and Novak, Nikola and Rödel, Jürgen
Title: Short crack fracture toughness in (1-x)(Na1/2Bi1/2) TiO3–xBaTiO3 relaxor ferroelectrics
Language: English
Abstract:

The fracture toughness in the lead-free relaxor ferroelectric (1-x)(Na1/2Bi1/2) TiO3–xBaTiO3 was investigated utilizing the surface crack in flexure method. To allow a comprehensive assessment, unpoled, and poled samples from the rhombohedral, the tetragonal, and the morphotropic phase regime were considered. It was found that the fracture toughness is up to 23% higher for the poled state. In order to cover the transition from ferroelectric to relaxor phase, the temperature dependence of 0.97(Na1/2Bi1/2)TiO3–0.03BaTiO3 was studied as well. Fracture toughness values of up to 2 MPam1/2 were determined, which are considerably above data for lead zirconate titanate materials. The results are rationalized using a simple transformation toughening-type model in conjunction with investigations into the ferroelastic behavior. The presented model can be applied without fitting parameters but utilizes measurements of the coercive stress and remanent strain as well as the elastic modulus.

Journal or Publication Title: Journal of the American Ceramic Society
Publisher: The American Ceramic 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: 04 Oct 2017 07:29
DOI: 10.1111/jace.15008
Additional Information:

Funding information Deutsche Forschungsgemeinschaft, Grant/ Award Number: RO954/25

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