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Transformation toughening in an antiferroelectric ceramic

Tan, Xiaoli and Young, S. E. and Seo, Yo-Han and Zhang, J. Y. and Hong, W. and Webber, Kyle G. (2014):
Transformation toughening in an antiferroelectric ceramic.
In: Acta Materialia, pp. 114-121, 62, ISSN 13596454, [Online-Edition: http://dx.doi.org/10.1016/j.actamat.2013.09.038],
[Article]

Abstract

Due to a larger specific volume of the ferroelectric phase, the antiferroelectric-to-ferroelectric transition is believed to have an enhanced toughening effect against fracture. The toughening requires a non-recoverable transformation in the crack process zone. Complementary measurement of the crystal symmetry, dielectric constant, field-induced polarization and Raman spectrum on ceramic Pb0.99Nb0.02[(Zr0.57Sn0.43)0.92Ti0.08]0.98O3 indicates that the antiferroelectric and the ferroelectric states are equally stable at room temperature. Raman mapping further reveals the presence of the ferroelectric phase in a localized zone at the crack tip after unloading. A significant phase-transition-toughening effect is demonstrated in the antiferroelectric ceramic with both indentation fracture and R-curve experiments. The effect in this model composition leads to toughness values ∼50% larger than other antiferroelectric ceramics with similar compositions and 60–130% higher than ferroelectric Pb(Zr, Ti)O3 ceramics. A simple analysis confirms the toughening effect from both volumetric phase transition and deviatoric domain switching during the transformation. The results suggest that other materials near phase boundaries may have similar high fracture resistance.

Item Type: Article
Erschienen: 2014
Creators: Tan, Xiaoli and Young, S. E. and Seo, Yo-Han and Zhang, J. Y. and Hong, W. and Webber, Kyle G.
Title: Transformation toughening in an antiferroelectric ceramic
Language: English
Abstract:

Due to a larger specific volume of the ferroelectric phase, the antiferroelectric-to-ferroelectric transition is believed to have an enhanced toughening effect against fracture. The toughening requires a non-recoverable transformation in the crack process zone. Complementary measurement of the crystal symmetry, dielectric constant, field-induced polarization and Raman spectrum on ceramic Pb0.99Nb0.02[(Zr0.57Sn0.43)0.92Ti0.08]0.98O3 indicates that the antiferroelectric and the ferroelectric states are equally stable at room temperature. Raman mapping further reveals the presence of the ferroelectric phase in a localized zone at the crack tip after unloading. A significant phase-transition-toughening effect is demonstrated in the antiferroelectric ceramic with both indentation fracture and R-curve experiments. The effect in this model composition leads to toughness values ∼50% larger than other antiferroelectric ceramics with similar compositions and 60–130% higher than ferroelectric Pb(Zr, Ti)O3 ceramics. A simple analysis confirms the toughening effect from both volumetric phase transition and deviatoric domain switching during the transformation. The results suggest that other materials near phase boundaries may have similar high fracture resistance.

Journal or Publication Title: Acta Materialia
Volume: 62
Uncontrolled Keywords: Antiferroelectric ceramics; Phase transition toughening; Raman mapping; R-curve
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Elektromechanik von Oxiden
11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 14 Apr 2014 10:42
Official URL: http://dx.doi.org/10.1016/j.actamat.2013.09.038
Identification Number: doi:10.1016/j.actamat.2013.09.038
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